An obscure German band from Frankfurt, Hessen, with the enigmatic name Ag A.M., which stands for Arbeitsgemeinschaft Ante Meridiem (= study group against the meridian). Absolutely nothing was known about its members before (with one exception) or after. They recorded their first and only LP independently in 1977 at the Regina Tonstudio in Limeshain. The line-up consisted of Peter P. Dettlaff (vocals, guitar, bass), formerly with the prog rock band Air, Gunter Westenberger (voc, g, accordion), Bernd Gansloser (voc, b, g) and Gerhard Muller (dr, cl, fl, org). They played an extremely wide range of Anglo-American music styles such as folk, world, country, country rock, folk rock, blues and prog rock with German and English lyrics, enriched with slightly psychedelic influences. In addition to the usual rock instruments, they also used an accordion, banjo and pan flute.

They released their only album, Erinnerungen An Eine Positive Phase (Memories of a Positive Phase), in 1977 as a private pressing by the music publisher Erich Bachmann in a small edition of a few hundred copies. The release, like the band itself, then disappeared completely into obscurity. Their legacy is a strange album full of surprises that cannot be assigned to any particular genre. A rare curiosity that ranks among the most obscure German independent productions of the 1970s.