Grech released his debut album Open Heart Zoo, produced by Andy Ross, in June 2002.

[1][2][3] He achieved critical acclaim for his falsetto title track, "Open Heart Zoo" (written when he was 15 years old), which was featured on a Lexus advert on British television.

March of the Lonely took a completely different approach from his previous CDs, and was much more acoustic, more guitar-based, with a thinner texture and softer atmosphere.

Demos on MySpace revealed a development of a heavier gothic sound, but in December 2008 Grech announced that his Meatsuit project had been terminated.

Along with Bloc Party, Graham Coxon, Tom Vek, Reuben and Biffy Clyro, he worked with yourcodenameis:milo, in their recording studio, to write a song in one day.

On 18 September 2015, Grech was featured on the song "Hexes" by the British progressive metal band TesseracT on their third album Polaris.

On 24 July 2015, Grech was featured on the debut self-titled GUNSHIP album on the song "Black Sun On The Horizon".

Musicians known to have toured with Martin include: 1 – Dali (5:40) 2 – Catch Up (3:47) 1 – Open Heart Zoo (Circus) (Radio Edit) (4:41) 2 – Open Heart Zoo (Album Version) (5:23) 1 – Open Heart Zoo (Album Version) (5:21) 2 – Storm (5:09) 1 – Push (Radio Edit) (3:56) 1 – Push (5:01) 2 – Bliss (1:38) 3 – Head Sty (5:25) 1 – I Am Chromosome 1 – Mighty Hands (4:15) 2 – Gratefully Punished (4:26) 3 – Father And Mother Figure (2:48) 4 – Freedom, Warmth And Security (2:53) 1 – Guiltless (Album Version) (7:47) 2 – Guiltless (Radio Edit) (4:00) 1 – Guiltless (7:41) 2 – Seed Of A Seed (3:29) 3 – Worthy (2:59) 1 – The Heritage (3:32) 2 – Ashes Over Embers (5:39)