# ai.hold_music A parameter for AI that can be passed in ai.hold_music at the top level of the [ai Method](./index.mdx). A URL for the hold music to play, accepting WAV, Mp3, and [FreeSWITCH tone_stream](https://developer.signalwire.com/freeswitch/FreeSWITCH-Explained/Modules/mod-dptools/mod-dptools:-gentones/Tone_stream_6586599/).