Matthew "Matt" Mercieca (born 19 July 1990), known professionally as Muxu, is a Maltese singer and songwriter. He is one of Malta's leading R&B artists, with multiple number-one singles, and has received various local awards.

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Mercieca started his career, as a songwriter co-writing with Maltese producer Jay Omaro. In 2008, he released his first single "Beat My Drum" which reached the number-one spot on the Maltese charts. It led him to be nominated "Best Newcomer" at the 2008 Bay Music Awards.^{[citation needed]} In 2009, he was signed to the UK label Play Records but was dropped after a year citing 'artistic differences'^{[citation needed]}. "Still Missing You" featuring Local singer and known DJ Talitha was released in late October 2009 and brought Mercieca back to the stage in Malta.^{[citation needed]}

In November 2014 Muxu wrote the lyrics for the song Diamonds for Frederica Falzon and the song finished in fourth place. In November 2015 Maltese singer Destiny Chukunyere performed a song with lyrics written by her and Muxu named Not My Soul. The song was placed first, giving Malta the second Junior Eurovision win in three years.^[1]