Doing anything on the phone will drain battery, no way around that unless it's plugged in. However, the screen is often the biggest drain. So if you can setup your tunes and forget them, and let the phone screen sleep, it should help.
If you need really advanced control you can check out our applications forum: Android Applications - Android Forums there are usually a few threads in there about battery widgets, saving battery and setting up automatic low-power profiles, etc...
Depending on what version of the EVO you have, check out the appropriate forum listed below. The people there are very knowledgeable and should be able to help better answer your questions.
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