In Money from Music, a survey of 5,000 musicians nationwide, Peter DiCola at Northwestern University School of Law found that recording and composing, including music sales, account for a surprisingly small share of music income: 12 percent. The number might be even lower, as high-earning musicians tend to make more money from copyright-related sources and DiCola's sample was less than representative of musicians at large; most of the respondents earned more than $40,000 a year and only 12 pe...