Musical instruments don’t just have an aural appeal, but a visual one, too. While you can’t shove an awesome guitar or drum kit into your computer, you can put these great music-themed wallpapers on your desktop.
Guitar

Download this wallpaper (2560×1600) [The Paper Wall]
Sheet Music

Download this wallpaper (1680×1050) [The Paper Wall]
Life Sucks Music Doesn’t

Download this wallpaper (1920×1080) [The Paper Wall]
Piano

Download this wallpaper (1920×1080) [The Paper Wall]
Jake’s Violin

Download this wallpaper (1920×1200) [The Paper Wall]
Mouse on the Keys

Download this wallpaper (1920×1200) [The Paper Wall]
Recording Studio

Download this wallpaper (1920×1200) [The Paper Wall]
DC Band

Download this wallpaper (1920×1080) [The Paper Wall]
Rock Map

Download this wallpaper (1920×1200) [The Paper Wall]