There actually is a way to put music in Rp's. If this question hasn't been completely answered with it's HTML answer, I will supply below. However, if you're wanting to post music on the board, I cannot say to do that, but if in a RP.....I would say.....to use (.wav's .ra's or .mid's) With these song file extensions you'll be able to play music without words and/or lyrical music, with words.... Remember to replace the brackets with the HTML "carrots"....
{bgsound src="url to name of song"}{/bgsound}
There's also .ra (Real Audio) HTML you can put into your RP to play music, I'll get that for ya real quick......This right here is the HTML I use or used within my RP's to play Eminem's "Cleaning out my closet." Therefore you can use the HTML below! ANY & ALL....FEEL FREE! BUT THERE'S A CLAUSE..... YOU WHO DECIDE TO USE THIS, MUST HAVE ABILITY TO PLAY REAL AUDIO'S....hehe copy 'n paste away
{center}
{embed src="YOUR MUSIC URL" align="baseline" border="0" width="300" height="70" controls="all" type="audio/x-pn-realaudio-plugin" autostart="true" loop="true"}
{/center}