For song request, set max songs to 0 to disable it for any group. As for !skipsong, you will have to make an alias command that checks if the user is bronze, if no, send denied message. If bronze, send command to skip song.
@if@[@userclass@||VIP Bronze||!playnextsong||Sorry, you don't have access to this cosmmand]
Note: Notice I selected "Run as User (Elevated Access)" on the right side.