Rivers' musical career started fairly early on, with him playing the tuba in a band in Arlington Middle School.

(Rivers' talents on guitar would later come into play in Limp Bizkit's Results May Vary album, the only album not featuring longtime guitarist Wes Borland, with Rivers playing both guitar and bass on select songs such as "Creamer" and "Lonely World".)

When the band did not work out, the two decided to try again, and this time Otto came into the picture to be the drummer at the suggestion of Rivers.

However, Rivers revealed in 2020 his departure from Limp Bizkit was due to liver disease caused by excessive drinking.

In absentia, live bass duties were covered by Samuel Gerhard Mpungu and Tsuzumi Okai.

[5] In early 2009, Rivers reunited with Limp Bizkit for tours and their sixth studio album, Gold Cobra, released in 2011.

Rivers cites Jeff Ament from Pearl Jam as a big influence on his playing.