He has worked as a composer, musician and singer with several artists, including Mike Francis, Niccolò Fabi, Andrea Bocelli, Nicola Piovani, Vincenzo Cerami,[1] Claudio Baglioni, Bungaro, Lorenzo Feliciati,[2] Simone Cristicchi, Antonello Venditti, Marco Mengoni, Angelo Branduardi, Il Volo and Vocintransito.

[4] With Mike Francis (musician) and Mario "Mari-One" Puccioni, Zammit has been a member of “Mystic Diversions”, with 6 albums and compositions featured in over 130 compilations published worldwide.

[5] He has performed and written for movie, television and theatre soundtracks, including films by Roberto Benigni and Warner Bros. cartoons.

In 2009 the album "Fly Away - The music of David Foster" was released and features Zammit as keyboardist and backing vocalist on three tracks.

The songs feature international artists such as Jay Graydon, John "JR" Robinson, Neil Stubenhaus, Robbie Dupree and Arnold McCuller.