Siebe was born in 1992 and grew up in Putney, Sydney, working as a piano teacher, accompanist, composer/arranger and a bass player. From an early age, he learnt the cello then took up the piano at seven. In his teens, he dropped the cello and picked up the electric bass and played in rock bands in high school. Classically trained in piano and learning rock by ear, he also developed an interest in jazz. His early jazz influences included pianist Herbie Hancock and bassist Jaco Pastorious. Throughout high school, he had lessons with Kevin Hunt on jazz piano and Saul Richardson on bass.  In 2010 he achieved honours in his Certificate of Performance for piano (CMUS). In 2014, he graduated from the Sydney Conservatorium finishing his Bachelor of Music Studies degree majoring in classical piano studying under Beethoven expert, Gerard Willems. He has also been taught and mentored by a wide range of distinguished musicians including bass virtuoso and jazz legend Steve Hunter, bass innovator Victor Wooten and world-renowned bass pedogogist Anthony Wellington. Siebe is now working as a piano teacher, accompanist, composer/arranger and a bass player.

Since 2013, Siebe has been composing his own works for the jazz-funk band he founded and leads, Funk Engine. They have recorded and released three albums- the first two under the guidance of ARIA winner and world music legend, Llew Kiek and respected recording engineer Richard Belkner. Funk Engine has been featured on several radio stations including Eastside FM, Fine Music and the ABC. He has also composed for, and is a member of, Australia’s only electric viola da gamba group, Elysian Fielda. Other band members include notable jazz musicians Matt McMahon, David Goodman, and Matt Keegan as well as baroque music expert and viola da gambist, Jenny Eriksson and singer violinist, Susie Bishop. 

Siebe has a great passion for experimenting with and playing in diverse music genres ranging from jazz and classical to rock and heavy metal. His multi-genre approach to music is evident in his bass playing and composing. His composition Dark Dreaming written for Elysian Fields combines elements of jazz and classical and morphs into something close to rock. Dark Dreaming appears on Elysian Fields’ debut CD, “What should I say”, which is Australia’s first electric viola da gamba recording. He has been featured twice in Cut Common being described as “one of the most multi-talented young musicians on the scene."