Composing and arranging music are loosely related, in that somebody sits down and writes out the music, but they are completely different concepts. Basically, composition is an act of bringing something into existence. Arranging is reinterpretation, expansion, or the movement of a piece of music into a different context. Music that has been copied from the original into a different instrumentation are considered transcriptions. This category is for general information about arranging. Make sure of the legality of your arrangements before marketing them.
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Berkleemusic - Arranging Courses
Links to courses available online from Berklee School of Music in Boston include basic arranging, film scoring, and notation using Finale or Sibelius. With fees.
Tips and tricks for music composers and arrangers: beginners music theory and orchestration, musical instruments range and transposition. Also downloadable sheet music.