Martyn Mazz (born Martijn Hubertus Johannes Terporten on October 13, 1983) is a Dutch artist and songwriter who was the lead vocalist in Van Gunn (2004–2008), 7 Days' Wonder (2009), primarily known as a singer in K-otic (2001–2003) and currently active solely as a songwriter.

[1] Growing up with music such as the Beatles, Rolling Stones, Tom Petty and Thin Lizzy mainly caused by his parents' influence, and later, on the verge of the crossover from 1980s glamrock and 1990s grunge, getting a taste of those both worlds mainly through (according to his own biography) sneaking his way to his sisters' record shelf.

[1][3][4] In the meanwhile Martyn always kept close ties with his original band Van Gunn, and they decided to move to Los Angeles to get more experience and to get on the road.

In 2008 Martyn moved to Rotterdam to start a study at a University for Music.

While studying at the University, Porter formed a band called 7 Days' Wonder with whom he recorded a five song EP and toured in Japan and the Netherlands, in its short existence 7 Days' Wonder did not achieve any commercial success.