How do I make a different song play when you ride a vehicle?
That will require a little plotscripting. If you havent plotscripted before, start by reading the Plotscript Tutorial first.
The trick is to use the vehicle's mount script and dismount script. Here are some example scripts
plotscript,start vehicle music,begin play song(song:vehicle music) end plotscript,stop vehicle music,begin play song(song:map music) end
You must adjust the names of the songs to match the names of your actual songs as they are defined in your .HSI file