Mark O'Shea is a singer-songwriter out of Nashville, TN. Originally from Australia, he spent time in London and LA before making his home in Nashville.
If you took an ipod loaded with Rascall Flatts, Tom Petty, The Eagles, John Mayer and The Beatles..put it in a vice and turned until it started to break ... and then hit play! - you'd get something in the vein of what Mark does...
It's basically great songs, played and sang really well... go figure..