activities began to take place outside AMM. Rowe has reported that he felt somewhat limited having been almost exclusively a Matchless Records artist, and that he wanted to explore music outside of AMM. Tension between Rowe and Prévost was exacerbated by the appearance of Prévost's second book of essays, Minute Particulars, which contained some disparaging comments about Rowe, who then left the group. In his review of Prévost's book, Walter Horn notes that while Prévost offers often scathing opinions of many people, Rowe is singled out for multiple barbs, and "one can hardly fail to wonder whether there's something of a personal nature lurking behind the barrage of what are superficially theoretical complaints." The trio's last performance with Rowe is documented on the 2005 double-CD Apogee. The set is shared with another of the electronic improvisational ensembles that emerged during the 1960s: Musica Elettronica Viva (MEV). The first CD is a studio recording in a joint session in England on 30 April 2004 featuring MEV's Alvin Curran, Richard Teitelbaum and Frederic Rzewski with Prévost-Rowe-Tilbury. This is the first occasion that the two ensembles have performed together, but not the first time they have shared a split release: each outfit filled a side of the LP Live Electronic Music Improvised, released on a US label in 1968 (AMM's side features excerpts from The Crypt sessions; MEV's side is an excerpt from their magnum opus "Spacecraft."). The second CD consists of the performances that each group gave at a festival held in London on 1 May 2004. Prévost and Tilbury continue to record and perform as AMM. They performed in London during December 2004, with Sachiko M joining as a guest, at the 2005 LMC Festival of Experimental Music, with David Jackman as a guest, and at a festival of experimental music in Belgium in February 2006. They also released a duo CD as AMM, Norwich, during 2005, and in 2009, the CD Trinity with guest John Butcher. In 2010 the core duo of Eddie Prévost and John Tilbury along with John Butcher, Christian Wolff and Ute Kangiesser released a CD called "Sounding Music" (the first simply tagged as AMM after 2005's Norwich) containing the concert performed at "Freedom of the City" festival, Conway Hall, London on 3 May 2009. More recent recordings on Matchless featuring the duo form of AMM include: 'Uncovered Correspondence' recorded in Jasło, Poland (2010) and 'Two London