John Fogerty

Following the singer-songwriter thread, you cannot forget this guy. As an anecdote about how absurd the music industry is - in 1985, Fogerty was sued for sounding too much like... CCR, the band he founded as its singer, songwriter, guitar player, arranger, producer. So, he was essentially sued for sounding too much like himself. It's no wonder there have been two decade-long gaps in his recording career.