The late Mark Wirtz (1943-2020) – a German-French songwriter-producer who found his biggest successes in England – is best-remembered for A Teenage Opera, an embryonic rock opera which inspired the likes of Pete Townshend and Paul McCartney and spawned Keith West’s U.K. No. 2 single “Grocer Jack,” a.k.a. “Excerpt from A Teenage Opera.”  Yet there was much more to Wirtz’s discography than that lone hit and its parent project.  Cherry Red’s Strawberry imprint recently boxed up five discs of Wirtz’s voluminous discography as Dream, Dream, Dream: The Anthology, and it’s every bit…