# MusicSequenceGetTrackIndex(_:_:_:) Gets the index number for a specified music track. ``` func MusicSequenceGetTrackIndex(_ inSequence: MusicSequence, _ inTrack: MusicTrack, _ outTrackIndex: UnsafeMutablePointer) -> OSStatus ``` ## Parameters `inSequence` The music sequence to obtain the track index number from. `inTrack` The music track whose index you want to obtain. This function returns an error if the music track is not part of the music sequence specified in the `inSequence` parameter. `outTrackIndex` On output, the zero-based index of the music track that you provided in the `inTrack` parameter. ## Return Value A result code. ## Discussion This function is for accessing only indexes for music tracks, not the tempo track. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)