John Spiker is an American musician primarily known for being the bassist for Tenacious D, and for the Industrial Rock band Filter from 2008 to 2010. He currently plays guitars and keys with Ronnie Vannucci's band Big Talk.
Spiker was born and raised in Columbus, Ohio and graduated from Upper Arlington High School in 1999. He got his start in music playing the piano and drums at a very young age. He has played guitar since age 12. He played bass and sung in Kyle Gass's side project Trainwreck, after Gass discovered him in Ohio with John Konesky. He also plays with Tenacious D, and has toured with them in North America, Europe and Australia. Spiker played bass on Steve Earle's Washington Square Serenade in 2007, which won a Grammy for Best Contemporary Folk Album. In the spring of 2008, John Spiker joined the band Filter. After touring the majority of '08, they returned to Los Angeles to shoot a Live Concert DVD. He played the UK's Reading and Leeds festivals with the D in the Fall of 2008.
In 2011, Spiker joined Ronnie Vannucci's new band Big Talk. He plays keys, guitar, and sings backup vocals with Big Talk. Spiker spent the beginning of 2011 touring with Disney Channel's Shane Harper. He played guitar and sang backup with Shane. He spent a good part of 2011 recording on the new Tenacious D album. Spiker engineering the album, along with playing bass. Spiker also Produced the new album for Brooks Wackerman's band, Kidneys, for which Spiker plays bass.