After briefly dreaming of playing the clarinet or saxophone[1] (taking up the latter in his teens due to fooling around), he discovered his voice in music after turning to double bass.
[1][3] Afterwards, Mothle went to the United Kingdom, joining other fellow exiled South African musicians Whilst there, he performed in many bands ranging from Julian Bahula's Jabula to Jim Dvorak's Joy and from the late 1970s, ones belonging to Dudu Pukwana.
Returning to South Africa in the 1990s, Mothle continued to perform with visiting musicians including Bob Mintzer, James Newton and René McLean.
He also worked as a bass instructor at Mmabana Cultural Centre and taught music at the Tshwane University of Technology, as well as continuing to perform at gigs and concerts.
[1][3] The album that Mothle as part of Joy recorded in 1976 with James Dvorak, Frank Roberts, and Keith Bailey was finally re-released in 2023.