Jazz fusion is usually played with instruments, without singing. The songs are often longer than those in pop music. A jazz fusion song could be five to ten minutes long. A pop song is usually about three minutes long. Also, jazz fusion songs have a long solo played by instruments. Frank Zappa, for example, had long guitar solos in his music, which was of the jazz fusion genre. In jazz fusion, solos are improvised, or made up as they are played, during a performance.