The earliest SACDs were stereo only, say the first 100 titles or so. After that m/c (multichannel) became pretty much the norm, but some artists may choose to release stereo only. A hybrid means it contains a redbook (standard) CD track as well as the hires audio; meaning it can be played in any CD/DVD player - though you are getting CD quality only, not hires. Every disc I have that has a m/c track also has a stereo hires track as well, and that is a good thing because not all discs translate well (bad mixing IMO) into 5.1. There are some discs that I use the 2ch track rather than the m/c - The Police 25th anniversary is a good example IMO; far too gimmicky. That doesn't mean there aren't discs out there that don't have a stereo SACD track. Discs that have m/c and stereo SACD tracks should indicate the fact that both are available, so just make sure you read the cover or details closely.