Sinead O'Connor has been in music since the '80's but it wasn't until 1990 when she broke out on the scene with "Nothing Compares 2 U" from her album I Do Not Want What I Haven't Got.  Since then she's been involved with a number of artists working with them on writing music and also recording songs too.  One of her latest collaborations was with Mary J. Blige.  Check out the video that made her really famous after the jump.