Conversation so far:
what illness did the musician Peter Green face?
Peter Green was diagnosed with schizophrenia and spent time in psychiatric hospitals undergoing electroconvulsive therapy during the mid-1970s.
how did the schizophrenia diagnosis effect  musician Peter Green's career
Many sources attest to Peter Green's lethargic, trancelike state during this period.
did musician Peter Green continue making music following schizophrenia diagnosis?
In 1979, Peter Green began to re-emerge professionally. He was signed to Peter Vernon-Kell's PVK label, and produced a string of solo albums.

Question: what year was he diagnosed?
Self-contained rewrite: what year was musician Peter Green diagnosed with schizophrenia?