[QUOTE] The point is still valid, though. Even as a new band, more than half their recorded material was self-written. This was indeed mould-breaking, and helped open the door to the ideas that gave rise to the pop/rock explosion of the 60s and 70s.[/QUOTE] In that case, the mould was broken by Chuck Berry or by the late-40s, early-50s Chicago blues bands (Muddy Waters et al.) who were the original rock and roll bands, or by the Sun Records singer-songwriters (Carl Perkins, Johnny Cash, Roy Orbison).