Macintosh Universal Binary applications are ones that run natively on both PowerPC and Intel-based Mac computers. These are sometimes referred to as Mactel versions, because they run and the Macintosh Intel-based machines.
Mactel Music Applications:

Airfoil
AudioExpress
AudioLeak -  an Leq (Long-Term Equivalent Level) analyzer for audio files.
CastAway - Wooden Brain Concepts
Crystal Synth
Boom Recorder
eJamming Station -  Real-time Internet-based music [...]

MacWorld Update: Apple today unveiled the new iMac featuring Mac OS X running on the new Intel Core Duo processor. According to Apple, the new iMac offers performance that is up to twice that of its predecessor.
The iMac now features dual-core processors, a built-in iSight video camera for video conferencing out-of-the-box, and the media experience [...]