I need your help...Jason Mraz, Colby Caillat, Natasha Bedingfield... Who else?

I am in love with the slow, summer fun, chilled songs by Jason Mraz, Colby Caillat and Natasha Bedingfield. I dont know of any one else who has this sound same as them...could you help? Also what type of music are they? ppl say alternative, but I look that up and get beyonce....Please help me...Music is life to me!! LOL!!