REQ: zplane - deCoda (music learning/transcription/practice) Mac OX
This would be an amazing tool for the Mac community! 
deCoda can decode any song so you can learn to play it in minutes. In seconds deCoda will tell you the key, tempo, chords where the verses and choruses are and more. Using deCoda is as simple as adding your favourite song and letting deCoda help you figure it out. Inspired and informed by those working in the music and recording industry, deCoda offers features that make learning a song more effortless than ever. deCoda has been built by zplane. zplane technology is used to make many of the biggest hits in the world by top artist and producers, and that same know-how is used to power deCoda.
Features:
Advanced chord and tempo detection algorithms
Flexible looping options
Automatic song structure detection - Part A, B C, A2, B2 etc.
Instantly transpose to a chosen key
Change tempo whilst maintaining the pitch
Focus EQ for isolating parts of the track
Melody information displayed on a piano roll
Exportable MIDI
deCoda can decode any song so you can learn to play it in minutes. In seconds deCoda will tell you the key, tempo, chords where the verses and choruses are and more. Using deCoda is as simple as adding your favourite song and letting deCoda help you figure it out. Inspired and informed by those working in the music and recording industry, deCoda offers features that make learning a song more effortless than ever. deCoda has been built by zplane. zplane technology is used to make many of the biggest hits in the world by top artist and producers, and that same know-how is used to power deCoda.
Features:
Advanced chord and tempo detection algorithms
Flexible looping options
Automatic song structure detection - Part A, B C, A2, B2 etc.
Instantly transpose to a chosen key
Change tempo whilst maintaining the pitch
Focus EQ for isolating parts of the track
Melody information displayed on a piano roll
Exportable MIDI