The original core members of PFM were Franco Mussida (guitars, vocals), Flavio Premoli (keyboards), Luciano Dovesi (bass), who preceded Giorgio Piazza (bass), and Franz Di Cioccio (drums, vocals). They came together in the mid-1960s while playing together as backup musicians for many different Italian pop, rock and folk singers such as Lucio Battisti, Mina, Adriano Celentano and Fabrizio De André. They appeared on many recordings for other artists during this period and quickly established themselves as top players on the Italian scene before forming the group 'I quelli' (deliberately ungrammatical, roughly translates to 'The Them', or 'Those Guys') in 1968. I Quelli released one album and some successful Italian singles.