There are 2 artists named EMA:

1) EMA is Erika Anderson is an American singer and songwriter from South Dakota. Originally the lead singer of the band Gowns, she released her debut album Little Sketches on Tape in 2010 on Night People. In 2011 EMA released her second album Past Life Martyred Saints, which has received many positive reviews.

Using solo guitar, piano, voice and tape collage her music could not be blessed with more heartfelt beauty, it seems almost impossible the amount of intimate feeling in the sounds, taking on the piece of music as an instrument in and of itself to accompany Erika's amazing voice and lyrics.

Website: http://cameouttanowhere.com

2) Emil Macha aka EMA makes electronic music since 2006.