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Import audio and MIDI files in GarageBand on Mac
You can import audio files of the following file types into a GarageBand project:
AIFF
CAF
WAV
AAC (except protected AAC files)
Apple Lossless
MP3
You can also import MIDI files into a GarageBand project. MIDI is a standard file format for synthesizers and other electronic music instruments. MIDI files don’t contain recorded sound, but do contain data that electronic instruments can use to produce music. MIDI files are available online and can also be exported by many popular music software applications.