I went to a Moody Blues concert last year on my birthday. They are a good band and they have many great songs other than the usual Nights in White Satin.
Queen is also very awesome. Freddy Mercury was coolest guy ever.
Also some other sweet bands Lynyrd Skynyrd, Eagles, Aerosmith, Led Zeppelin, Kansas, CCR, Black Sabbath along with people like Eric Clapton, Elton John, Cat Stevens, and all the Beatles members solo stuff.