Love `em or hate `em, CDs have changed a music fan's life. Thousands of records long out of print started to become available again once CDs took hold in the mid-1980s. Listening to a reissue of Elvis Costello's "King of America" reminded me of how my life has improved thanks to having heard some of its secret songs. So, I decided to ask some regular OnMilwaukee.com talkbackers who love music to weigh in with their faves.