If you haven't, give this article a read, and download the Honeycomb music app here. Confirmed working on my CM7 Captivate, and it works on the Epic and Fascinate, so it should work fine on any Captivate.
Note: If your ROM uses the AOSP Music app, you may have to delete it from /system/app first. Otherwise, you'll have two apps with the same name (both of which might force close on launch). Stock and ROMS that use the Samsung app should be fine.
Note: If your ROM uses the AOSP Music app, you may have to delete it from /system/app first. Otherwise, you'll have two apps with the same name (both of which might force close on launch). Stock and ROMS that use the Samsung app should be fine.