It is becomming clear that not all of the beginners on this forum are specifically interested in playing classical piano solos. Some people want to play POP solo music while others are interested in playing accompaniment to a band or singer. For those interested in the last, take a look at:

The Keyboard Accompaniment Course by Gayle MacAulay Dunsmoor

This course was specifically designed to be done on your own either with or without a teacher, as a primary course or as a learn at your own pace while taking classical piano lessons.