Flowkey is an online tool for practicing piano or keyboard with an interactive interface.
Gear4music sells guitars, drums, keyboards, and more music gear. Their mission is to make purchasing and owning instruments and equipment easy through good prices and good service.
Guitar Center is the largest retail music gear company in the world, known for selling guitars as well as many other musical instruments and accessories.
Steelseries is a gaming peripheral manufacturer. Their products include headsets, keyboards, mice, and gaming surfaces.