Frank Wilson's "Do I Love You?" (1965)
This seven-inch Motown single was never released to the public, but it sold to a Scottish collector for 15,000 pounds (now about $30,000) in 1999. That's the most ever paid for a seven-inch single. Soul music is alive and well in the UK, where it's known as Northern Soul and is as popular as dance music in clubs. Wilson's song did reach the public on reissues and CDs [sources: Jahsonic and Northern Soul].