How to play music from my computer on iPhone (without iTunes)? How can I play music that resides my computer on my iPhone (plugged in to my stereo)? I am at home, they are on the same wifi network. The computer runs Windows 7.

I tried iTunes's sharing feature and my computer's "library" was listed on the phone, but  when I select it, the symbol spins for a minute then gives up. Once it did work, but it only listed about a hundred songs (of tens of thousands). I don't know why.

I'd like to choose the music from the iPhone.

Edit: I have much more music than disk space on my iPhone, so I can't copy it all.
You want a DNLA streaming app for your iPhone, which can play a music library via a DLNA server running on your PC.

For the PC side, google "windows DLNA server" will get you current choices, but at this time there are Plex, Tversity, and Twonky

On the iPhone side, look at apps like Media:connect. There are summaries of current choices online, like this one: http://blog.dreamcss.com/iphone/dlna-streaming-apps-for-iphone/