With forScore, you can carry a complete library of music scores with you. You can download most any PDF into forScore and even annotate it using text boxes or add common musical notation symbols with the built-in library of stamps or your own, custom-designed stamps. forScore has an organizational system that lets you sort your music files with six types of metadata. There’s a metronome that marks time audibly or visually. Auto-turn and half-turn options let you practice without pauses, and it can even work with AirTurns BT-105 Bluetooth page turner. You can display the music vertically, or turn the iPad horizontally for a wider view (requires scrolling to see the entire page). The iPad-only app is $4.99 in the iTunes app store.