One to watch: Dan Croll, singer, 23 With his geeky glasses, it's hard to imagine this indie pop singer from Liverpool was once a professional rugby player. After a leg injury, he studied music at the Liverpool Institute of Performing Arts. Paul McCartney has praised his music. Other fans include Mumford and Sons' Ben Lovett. His new single ,"Compliment Your Soul," has been added to the Radio 1 Playlist. Now he is putting the final touches to his debut album, which is out this summer.