In this episode the marvellous Mark Williams Zooms in from mid-Wales to regale us with tales from the heyday of the UK's underground press and his later involvement with the L.A. punk scene.

We start in mid-'60s Newcastle – where our guest drummed with beat combo the Jailbirds – and move on to his days at the Birmingham Arts Lab via a flat above London's hallowed 2i's coffee bar. A return to the capital in late '68 brings Mark to the offices of leading underground paper International Times (a.k.a. it) and his irregularly-recompensed stint as the editor of its "Plug & Socket" music section. A weekend in the arms of Janis Joplin is among the highlights of his it tenure before he departs to launch the short-lived Strange Days – for which he was due to interview Jimi Hendrix on the day after the guitarist died.

It being 50 years since the first Knebworth festival, we revisit that Allmans-headlined "Bucolic Frolic" and discuss the phenomenon of such gatherings. Jumping forward five years, we hear about our guest's years in Los Angeles and his work with Slash (the publication and the label) – the Germs connection leading into clips from a 1983 John Tobler audio interview with Joan Jett. Finally we hear about the 1981 launch of Felix Dennis' splendidly opportunistic New Music News and Mark's memories of editing his hilarious pal Tom Hibbert.

Mark talks us out with quotes from newly-added library pieces about teen heartthrob Bobby Vinton (1962), the broken-through Doors (1967), infamous Stone/Beatles lawyer/manager Allen Klein (1969) and southern-soul Mecca Muscle Shoals (1970)... after which Jasper wraps up the episode with his thoughts on militant (and prescient) rappers Dead Prez (2003) and the enduring influence of Chic (2021).

Many thanks to special guest Mark Williams.

Pieces discussed: Janis Joplin: Janis, Jimi Hendrix, The Rolling Stones: Free Concerts,When the Allman Brothers Band Headlined the First Knebworth, Cancel the inquest: the festival she lives, Knebworth: Great music but a non-event, Letter from Britain, L.A. Punk: Pogo-ing On The Fault Line, Joan Jett audio, It's Tom Hibbert's World, Bobby Vinton, The Doors, Allen Klein, Muscle Shoals, Alabama, Dead Prez and The Chic Effect.