There are several bands/singers performing under the name Martina:

1.) Martina Aitolehti (simply known as Martina) is a Finnish socialite, performer, dancer and singer. In January 2011 Martina released her first solo single 9 digits. Her debut album martina was released in March 2011. Martina used to sing in a duo called salarakkaat (Secret lovers) in 2005.

2) Martina Mahić is an aspiring Croatian singer born in 1988, best known for her memorable presentation on Dora 2008 festival (Croatian Eurosong qualification). This performance is significant for outdated clothing, bad dancing and also Martina's terrible singing. She became famous overnight in Croatian YouTube community. Now she is a legend.