[Geoff Bacon]

This seems to be a very specialised request which will have limited appeal to other users (but I could be wrong)

I also can't see that MSP would have any easy way of handling this automatically as you would have to somehow trigger it's menu system.

My suggestion, bearing in mind that you have the coding experience you mentioned, is that you set up a page on a web server which can display a list of available songs.
As well as showing the list, the users need to be able to "vote" for a displayed song (you can design what happens when a song is upvoted).
The leader of the group can look at this web page on a mobile phone, separate from his tablet, to determine which song to play (and he also needs a mechanism to dismiss the entry)

The advantages of this approach are that you can design exactly how the users interact with the system, it is independent of MSP so won't be affected by any future changes to MSP (or limit the changes that Mike might want to make) and it means that Mike is freed up to develop other features that multiple users have requested.

Cheers
Geoff