What music formats does the iPod support?
All iPod models have an upgradable firmware that “enables support for future audio formats”. The information provided below is what was provided with the release of each model, but firmware upgrades enable compatibility with additional and more recent formats. The iPod (1st Generation), introduced October 23, 2001 and discontinued July 17, 2002, supports MP3 (up to 320 Kbps), MP3 Variable Bit Rate (VBR), WAV, and AIFF. Mac-compatible versions of the iPod (2nd Generation), introduced July 17, 2002 and discontinued April 28, 2003, support all of the formats of the first generation models in addition to AAC (up to 320 Kbps) and Audible, and Windows-compatible versions support MP3 (up to 320 Kbps), MP3 Variable Bit Rate (VBR), and WAV.