Bifwynne, Mahler as background music! Shame on you!!!! You're going to get drummed out of the club. But so far as Mahler goes you've probably picked the best one. :-)
FWIW, in order to conserve time, I usually set aside listening to classical music for those times when I read. Kills two birds at one time, neither being a mockingbird. If the book is really good and I'm listening to merely 'good' music I'm not missing much I guess. If I find myself distracted I don't know whether its because the book is really boring, the music is better than just good, or I'm admiring what I have accomplished in putting together my audio system. Another mystery to solve!
I find it most difficult to read, though, when the music was originally composed for the solo piano by Beethoven, Brahms, Chopin, Debussy, Liszt, Prokofiev, Schumann or Schubert. I do find it easy to read when the music is transcribed from orchestral works. In fact that is probably my favorite reading music.
Then there is sleeping music, Mozart, maybe at night. :-)