Astrobiology is the study of the origin and development of life on this and other planets. What fascinates people about astrobiology is that it seeks answers to long-standing unsolved questions: How quickly did life evolve on Earth and why did life persist here? Is there life elsewhere in the Solar System or beyond? The research of astrobiology has become more crucial than ever in recent decades, as biologists have discovered microbes that live in ever more extreme settings, such as bubbling hot springs, in acid, or deep within rocks. Rooted in strong and rigorous research, astrobiology incorporates the work of microbiologists, geologists, and astronomers. In this Very Short Introduction, David C. Catling introduces the origins of astrobiology and demonstrates its impact on current astronomicalresearch and potential future discoveries. ABOUT THE SERIES: The Very Short Introductions series from Oxford University Press contains hundreds of titles in almost every subject area. These pocket-sized books are the perfect way to get ahead in a new subject quickly. Our expert authors combine facts, analysis, perspective, new ideas, and enthusiasm to make interesting and challenging topics highly readable.Originally published in 1943, Models for Beginners in Composition represents one of Arnold Schoenberg's earliest attempts at reaching a broad American audience through his pedagogical ideas. The novelty of this book was its streamlined approach, basing all aspects of composition including motivic design, harmony, and the construction of themes on the two-measure phrase. This newly revised edition by Gordon Root incorporates many of Schoenberg's correctionsto the original manuscript. It also includes a significant commentary elucidating the evolution of Schoenberg's pedagogical approach.In its function as a practical manual for the American classroom, Models for Beginners in Composition is unique among Schoenberg's texts. The current Commentary explores Schoenberg's experience as a teacher at UCLA while tracing the development of the two-measure phrase as the main component of his pedagogical method. It demonstrates the way in which Schoenberg simultaneously preserved and adapted European ideas about tonal theory and pedagogy when he came to America, a give and takethat allowed for increased theoretical originality and scope. Models for Beginners in Composition established the two-measure phrase as one of the most significant of Schoenberg's contributions to American music education. This new edition, with Schoenberg's corrections and newly added commentary, allows readers to utilize and explore the text in greater depth. Students of composition, Schoenberg scholars, music theorists, and historians of music theory alike will no doubt welcome this new edition.