Birdsong in the music of Olivier Messiaen

The intention of this investigation is to formulate a chronological survey of Messiaen's treatment of birdsong, taking into account the species involved and the composer's evolving methods of motivic manipulation instrumentation in corporation of intrinsic characteristics and structure. The approach taken in this study is to survey selected works in turn, developing appropriate tabular forms with regard to Messiaen's use of 'style oiseau', identified bird vocalisations and even the frequent appearances of music that includes familiar characteristics of bird style, although not so labelled in the score. Due to the repetitive nature of so many motivic fragments in birdsong, it has become necessary to develop new terminology and incorporate derivations from other research findings. The 'motivic classification' tables, for instance present the essential motivic features in some very complex birdsong. The study begins by establishing the importance of the unique musical procedures developed by Messiaen: these involve, for example questions of form, melody and rhythm. The problem of 'authenticity' - that is, the degree of accuracy with which Messiaen chooses to treat birdsong- is then examined. A chronological survey of Messiaen's use of birdsong in selected major works follows, demonstrating an evolution from the general term 'oiseau' to the precise attribution of particular material to particular birds. In later periods the composer explores new Instrumentation and accompanying harmonies (or chordal complexities) to create as closely as possible the unique timbres and other idiosyncrasies of birds' vocalisations; at the same time, Messiaen begins to introduce a much larger variety of species in to his music using birdsong from all over the world. The representations of birdsong are much more 'authentic', or at least more colourful, than in previous works and perhaps, with the accompanying portrayal of landscape in (for example) Catalogue, greater verisimilitude is created. The inclusion of so many exotic species in the scores of, for instance Sept Haikai and Chronochromie is a result of Messiaen's meticulous ornithological investigations and painstaking notations. More importantly, the monophonic bird style tends increasingly to be replaced by other textures such as two-voice homophony, homorhythm, hybrid forms and polyphony. The most pertinent works of this final period are evaluated clearly displaying the many features of each birdsong and call, and their part in the structure of the pieces. Conclusions are drawn concerning the technical means by which the composer realises t he distinguishing features of each birdsong. The thesis is sustained by a close study of three elements governing Messiaen's treatment of birdsong (rhythm, .melody and structure), especially considering the close relationship between them. There has not previously been a systematic attempt to analyse Messiaen's pieces in this way. This research provides a coherent structural overview of Messiaen's employment of birdsong, displaying recurring patterns found in the use of rhythm, melody and structure. Further, the recent publication of Messiaen's 'Trait de Rythme, de Couleur et d'Ornithologie' enables the research to be genuinely up-to-date, using the composer's personal comments on, and analyses of, birdsongs found frequently in his music

Big Bang Nucleosynthesis and the Missing Hydrogen Mass in the Universe

It is proposed that when the era of the big-bang nucleosynthesis ended, almost all of the 75 percent of the observed total baryonic matter remained in the form of hydrogen and continued to exist in the form of protons and electrons. They are present today as baryonic dark matter in the form of intergalactic hydrogen plasma. To test our hypothesis we have investigated the effects of Thomson scattering by free electrons on the reported dimming of Type Ia supernovae. The quantitative results of our calculation suggest that the dimming of these supernovae, which are dimmer than expected and hence more distant than predicted by Hubble expansion, is a result of Thomson scattering without cosmic acceleration.Comment: A typographical error in equation (7) page 3 has been correcte

Mating Flights of \u3ci\u3eEphoron Album\u3c/i\u3e (Ephemeroptera: Polymitarcidae) in Michigan

Mating flights of the mayfly Ephoron album (Say) were observed on the Sturgeon River in Houghton County, Michigan, on five evenings between 16 and 22 August, 1977. Peak emergence occurred about 30 minutes befqre sunset on 19 August and the flight period lasted about two hours. Many more adult males than females were collected on three evenings, but on one evening females greatly outnumbered males collected

Buoyancy-driven inflow to a relic cold core: the gas belt in radio galaxy 3C 386

We report measurements from an XMM-Newton observation of the low-excitation radio galaxy 3C 386. The study focusses on an X-ray-emitting gas belt, which lies between and orthogonal to the radio lobes of 3C 386 and has a mean temperature of $0.94\pm0.05$ keV, cooler than the extended group atmosphere. The gas in the belt shows temperature structure with material closer to the surrounding medium being hotter than gas closer to the host galaxy. We suggest that this gas belt involves a `buoyancy-driven inflow' of part of the group-gas atmosphere where the buoyant rise of the radio lobes through the ambient medium has directed an inflow towards the relic cold core of the group. Inverse-Compton emission from the radio lobes is detected at a level consistent with a slight suppression of the magnetic field below the equipartition value.Comment: 11 pages, 10 figures, accepted for publication in MNRA

Campus & alumni news

Boston University Medicine was published by the Boston University Medical Campus, and presented stories on events and topics of interest to members of the BU Medical Campus community. It followed the discontinued publication Centerscope as Boston University Medicine from 1991-2005, and was continued as Campus & Alumni News from 2006-2013 before returning to the title Boston University Medicine from 2014-present

Nonlinear Dynamics of a Bose-Einstein Condensate in a Magnetic Waveguide

We have studied the internal and external dynamics of a Bose-Einstein condensate in an anharmonic magnetic waveguide. An oscillating condensate experiences a strong coupling between the center of mass motion and the internal collective modes. Due to the anharmonicity of the magnetic potential, not only the center of mass motion shows harmonic frequency generation, but also the internal dynamics exhibit nonlinear frequency mixing. We describe the data with a theoretical model to high accuracy. For strong excitations we test the experimental data for indications of a chaotic behavior.Comment: 4 pages, 4 figure

Towards More Practical Linear Programming-based Techniques for Algorithmic Mechanism Design

R. Lavy and C. Swamy (FOCS 2005, J. ACM 2011) introduced a general method for obtaining truthful-in-expectation mechanisms from linear programming based approximation algorithms. Due to the use of the Ellipsoid method, a direct implementation of the method is unlikely to be efficient in practice. We propose to use the much simpler and usually faster multiplicative weights update method instead. The simplification comes at the cost of slightly weaker approximation and truthfulness guarantees