The main theme is this remix of the surface of the sun. It is difficult to find. It can only be intercepted from the movie. You can find it on this website/play.aspx?reg_id=1588871&song_id=4364935. Kiss-ass soundtrack is attached. Table:

Here's the complete list of songs from Kick-Ass:

■Opening scene - Stand Up – Prodigy

■Movie - Can't Go Back – Primal Scream

■There's A Pot Brewing – The Little Ones

■Frank's apartment - The Barber of Seville Overture – Zagreb Festival Orchestra

■Kick-Ass fight being videotaped - Omen – Prodigy [ thx to @Ryan for correcting the scene]

■Goes to Razul's apartment - Bongo Song – Zongamin

■Hit Girl at Razul's apartment - (Banana Splits) Tra La La Song – The Dickies

■Frank says kill Kick-Ass - Chi Mai Del Mio Provò, Piacer Piu Dolce! [Act 2], Idomeneo – Wiener Philharmoniker

■Applying self-tanner in bedroom - Starry Eyed – Ellie Goulding

■Kick-Ass tries on the cape - This Town Ain't Big Enough For Both of Us – Sparks [thx to Lauren for the scene]

■Driving with Red Mist - Crazy – Gnarls Barkley

■Teddy bear camera – In The House In a Heartbeat – John Murphy [from 28 Days Later, thx to @Ryan for the correction]

■(unknown scene) – We're All in Love – New York Dolls [@Triad thinks this is the scene where Hit Girl and Kick-Ass fly away on the jet pack. the order doesn’t 't seem to fit but I could be wrong. Maybe it plays twice? What do you think?]

■Hit Girl kills the door guards in the lobby - Per Qualche Dollaro In Piu – Ennio Morricone [correction

based on comment from @Will O.]

■Live webcam, attempted execution – Adagio In D Minor by John Murphy [thx @Sean for the addition]

■Hit Girl rescues Big Daddy and Kick Ass – Kanada's Death, Pt. 2 from the Sunshine soundtrack [thx @toughluck for the addition]

■Hit Girl takes out the apartment - Bad Reputation – Joan Jett & The Blackhearts

■Kick-Ass flies in on Jet pack - Battle Hymn Of The Republic – Elvis Presley [version by the US Army Band]

■Kick-Ass and Hit Girl fly away on jet pack – The Surface Of The Sun (remix) by John Murphy [@Jessica has posted a link to the remix version of the song that sounds very similar to the jet pack scene from the movie. you can find the actual song playing in the background of the scene above]

■End credits song - Make Me Wanna Die – The Pretty Reckless

■Second end credits song - Kick Ass – Mika

Original music for Kick -Ass – Ilan Eshkeri, Henry Jackman and John Murphy