Being a composer starts with some musical talent, but it doesn't stop there. You'll need to know how to read music and understand the roles different instruments play in each composition, be it an orchestra, a rock band, or just a guitar. And because being a composer, particularly a songwriter, is a competitive trade, it doesn't hurt to have a thick skin and plenty of perseverance.
Salary depends on the type of composing you do. For example, composers who write music for TV commercials can earn from $300 to $50,000 per commercial. A film score composer can earn up to $200,000 per film.