This is hard. Doesn’t the music “look” different in the blue waves than the speech?
There is an experimental Nyquist script at Need pointers on adding feature to search pattern that tries to find identical audio patterns but there are no controls for the length of the result. Ask there if you like. Post an example snippet with some hold music and some speech - see https://forum.audacityteam.org/t/how-to-post-an-audio-sample/29851/1 for how to attach a suitable file.
Gale