Try a GB based MIUI rom. It has a great music player IMHO, along with some other great features. Version 2.3.30 is the latest (and final) GB version for the Nexus One. Get it from miui.us or miuiandroid.com. Or download from the N1 Dev forum e.g. QND version.
Hope this helps
Btw, I used to dismiss miui, and could never warm to its launcher. However install MIUI Black Ice theme (ICS lookalike) and Go Launcher and away you go.
Sent from my Nexus One using XDA
Samsung Note 2 - Dr Ketan's ROM
Nexus One - CM 7.1 final (still using as a backup phone!)