Stereo Sid-Player v7.0 (1987 by Mark A. Dickenson) - This is by no means the newest version of this excellent Sid player, but I like to keep all versions of software around because I've found that sometimes newer versions will remove features, or introduce new bugs.  This particular archive has a nice collection of 18 stereo sids included from the great 1980's.

Please note - you will need to have two SID chips in your Commodore 64 to get full benefit from this program.