How to play music on an iPhone on someone else's computer?

I was wondering if you could play music from your iPhone on a friend's computer, PC. If so how? He already had iTunes but it doesn't really work on there. I don't want to download the music onto his iTunes. Just want to play the music from my phone on the computer. Also, is there a way of doing so without iTunes?

IPhone iCloud backup not working

My iPhone 4 is backed up onto iCloud on iTunes. It has never gave me any problems before, but currently my ICloud won't back up my data. It has a error code that there's not enough space on my iPhone, should I reset it to factory mode and try restoring it?

My iphone 4 won't let me play music or videos?

So recently my lock button stopped working and my phone keeps lockin and unlocking itself and goin to the slide of turn off screen so i put on the touch i on to lock screen thingy. But as of yesterday my phone won't play vidoes or play music. It loads an buffers but when i hit play it doesn't actually come on. I thought of turning it off maybe but how will i get it back on if the button doesn't work? Could someone either tell me how to put phone nack on without lock button or how to fix the music and videos problem please?

DIGITAL / MODERN way of validating a ticket?

Dealing with theater tickets I want a new way of validating tickets that's new and modern. Instead of boring print out the list. Can your idea's beat the current Scanner / IPhone Scanner idea?

Added (1). Just wandering if there are alternatives in the market - Not looking to invent but have a USP other other theatre companies in the area

Is the Iphone 4S 8G the only one that's going to be on the market?

I have a 4 but it's a little messed up so I want to upgrade. I'm eligible for an upgrade. I can see that the 4S will be a free upgrade but only for the 8G. Is that correct? 16G is not going to be on the market for the 4S? 8GB is too small for me but I'd rather not spend the money on a 5S or 5C if I can avoid it.