Music Pump is a feature rich Android DAAP Client that lets you to stream and sync music from your PC or NAS to your android device. All you need is a DAAP Server.
Following servers have been tested: rhythmbox, mt-daapd, firefly, tangerine, forked-daapd. Many NAS devices have a built-in DAAP server. (Sometimes DAAP is called iTunes Music Sharing)

Note: This app does not support streaming music from iTunes.

Features:

• Caching the database index locally for faster access to the music. The index only needs to be refreshed if you added new music to the library.
• Should have no problem importing large music libraries ( > 20’000 songs)
• Songs, albums and playlists can be downloaded in the background and will be added to a local playlist which will show up in the playlist section of many music players.
• The application has an offline mode feature to play your files on the sd card
• Cover Art support: Covers are loaded from the id3 tags and/or from the last.fm website
• Optimized UI for Android Tablets
• Control music playback from your bluetooth headset buttons and from inline headphone remotes
• Basic Homescreen Widget
• Lockscreen player control in some custom roms (e.g MIUI)
• Playback stops on incoming calls, headset removal or when another media player is started