Entwistle played his bass guitar as a lead instrument, employing a "full treble, full volume" sound, as well as often using pentatonic lines and a typewriter finger approach. He recorded the first bass solo in the history of popular music on The Who's song "My Generation". Other notable examples of Entwistle's playing are "Boris the Spider" and "The Real Me". As he developed his sound and refined his skill, Entwistle's bass sounded like a VOX Amplifier. At the time of his death he had a collection of over 400 instruments that reflected the different brands he used over his career: Fender, Rickenbacker, Alembic, Warwick were the brands he used most. He owned many of the most expensive bass guitars in the history of the world.