If Emerson Hart's name wasn't a household word when he released his first solo album, 2007's Cigarettes and Gasoline, his voice and his songs were already familiar to millions of fans from his years as the leader of the group Tonic. Hart was born on July 21, 1969, in South Orange, New Jersey, where as a child he became close friends with Jeff Russo. Both Hart and Russo took up the guitar in their teens, and in 1993 the two decided to put together a band; enlisting bassist Dan Rothchild and drummer Kevin Shepard, they formed Tonic and hit the road for Los Angeles. In 1995, Toni...