Upgrading from:

Miscellaneous`Music`

All the functionality in Miscellaneous`Music` is now available through the newly created Music Package.
Scale is now available as MusicScale.

To access functionality from the new Music Package, load Music`:

Version 5.2 << Miscellaneous`Audio`

This plays a perfect fifth:

Version 5.2 Play[Sin[2 Pi Aflat4 t] + Sin[2 Pi Eflat5 t], {t, 0, 0.2}]

This plays a major scale in just intonation that starts at 440 Hz and lasts for 3 seconds:

Version 5.2 Scale[JustMajor, 440, 3]