On Aug. 15, 1975, it was officially announced that Peter Gabriel had left Genesis. The announcement followed weeks of speculation that a split was about to occur. At the time, a record company spokesman issued a statement that Gabriel was leaving the band to concentrate on “other literary and experimental interests outside of music.”

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Peter Gabriel's own explanation is remarkably consistent with how his career progressed.  As he predicted, in the future he and the other musicians did work together again.  E.g. Phil Collins played drums on the third PG solo album, and PG sang backup on some of Collins' material.  ("Take Me Home").

His future within music was, indeed, in as many situations as possible!