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By Greg Pliska
Answer: COURTNEY LOVE

The audio file is composed of 12 song clips of varying lengths, with the pitch having been altered on eleven of them.

Solvers must ID the songs, and recognize that each one has been adapted from an earlier classical work (as clued by the flavortext phrase “what material it’s composed of”). Solvers need to identify the composers of these original works, and then index into those composers’ surnames by the number of seconds in the clips.

Popular Song Artist Pitch Shift No. of Secs. Orig Composer Original Work Letter
American Tune Paul Simon 0 3 BACH St. Matthew Passion C
This Night Billy Joel 10 7 BEETHOVEN Pathétique V
Could it Be Magic Barry Manilow 9 3 CHOPIN Prelude in C minor O
A Groovy Kind of Love Mindbenders 11 5 CLEMENTI Rondo from Sonatina in G E
My Reverie Ella Fitzgerald 7 7 DEBUSSY Reverie Y
It’s Now Or Never Elvis Presley 2 6 DI CAPUA O Sole Mio U
(I Can’t Help) Falling in Love with You UB40 5 6 MARTINI Plaisir d’Amour N
I Don’t Want to Walk Without You Harry James & His Orchestra 6 2 MENDELSSOHN Allegretto grazioso in A major (Frühlingslied, or Spring Song) in Book 5 of Lieder ohne Worte (Songs Without Words) E
Hate Me Now Puff Daddy/Nas 3 2 ORFF Carmina Burana R
Hello Muddah, Hello Faddah Alan Sherman 8 8 PONCHIELLI Dance of the Hours L
All by Myself Eric Carmen 1 10 RACHMANINOFF Piano Concerto No. 2 in C O
Once Upon A Dream Sleeping Beauty 4 1 TCHAIKOVSKY Sleeping Beauty, Act I, The Garland Waltz T

Finally, ordering the extracted letters by the number of semitones the clip has been shifted (from 0 to +11) spells the answer COURTNEY LOVE.