Angus, Thongs and Perfect Snogging

On the first day of the school year Georgia and her friends, Jas (Eleanor Tomlinson), Ellen (Manjeeven Grewal) and Rosie (Georgia Henshaw) spot two new brothers that have just moved to Eastbourne from London. Fraternal twins Robbie (Aaron Johnson) and Tom (Sean Bourke). The girls follow the boys, who are exploring Eastbourne with their friend Dave "the Laugh" (Tommy Bastow).Georgia then hatches a plan to get close to Robbie. Realising that Robbie likes cats she pretends her cat, Angus, has gone missing. Jas has Angus on a leash, but he escapes and Tom rescues him. Jas and Tom begin dating while Robbie is seeing Georgia's rival - Lindsay.In the midst of all these, Georgia's father has been offered a job in New Zealand, and he goes to New Zealand to prepare for the family to move out with him. During his absence, Georgia's mum hires a handsome builder called Jem to re-do the living room, and begins to spend increasingly longer periods of time with him, making Georgia worried as to the state of her parents marriage.In an attempt to "grow up" for Robbie, Georgia then goes to have "snogging lessons" with Peter Dyer (Liam Hess). He becomes infatuated with her and at a party the following night, he tries to kiss her, causing her to fall in to a bush and expose her underwear to Robbie, Lindsay, Jas and Tom, who see her on the ground with Peter. In order to get away from Peter, Georgia tells him that she is a lesbian. Tom invites Jas to go swimming with him and Robbie. Georgia conspires to meet them at the pool and brings her sister along as she is stuck babysitting her. While in the pool Robbie and Georgia kiss. Robbie then leaves, claiming that he has to "sort some things out" but that he will phone Georgia later.A few weeks later Dave the Laugh invites Georgia to a gig for Robbie's band, the Stiff Dylans. After reading Men are from Mars, Women are from Venus Georgia hatches a plan to make Robbie to realize his feelings for her by going to the gig with Dave the Laugh. Robbie tries to talk to Georgia at the gig, but is stopped by Lindsay.At school, Dave finds out that Georgia was only using him to make Robbie jealous and so stops talking to her. When Dave tells Robbie that Georgia was only using Dave, he stops talking to her as well. When she finds out it was Jas that leaked this information, they have an argument, and they vow never to speak to each other again.Feeling like there is no point in staying in England, Georgia decides that she would like to move to New Zealand. Before she leaves she goes to the beach for a walk knowing Robbie would be there and apologizes to him. Robbie tells her that he dumped Lindsay and he admits that he still likes her.In the end Georgia's mum takes her to a club for the first time and it turns out to be a surprise fifteenth birthday party, which Jas had secretly organized with Georgia's mum. She is greeted by all her friends and her family, with Jas and Georgia befriending each other again. As a surprise, Georgia's father returns from New Zealand, deciding to stay in Eastbourne for a better job opportunity. It is also revealed that Jem is gay, and that his boyfriend is the owner of the nightclub. The Stiff Dylans are performing the song "Ultraviolet" which Robbie had written about Georgia, when they are interrupted by Lindsay who had come from her own party (to which no-one had turned up) and tells Robbie that he would either take her back or lose her forever. He tells her that Georgia is the one he wants, and he kisses Georgia on-stage.Taken from Wikipedia.

Question: What song do the Stiff Dylans perform?
Answer: Ultraviolet