Playing on the iPod is the first movement of Mozart's Requiem, one of my all-time favorite musical pieces. As far as I'm concerned, it is clearly inspired by divinity.
This first movement was the only one which was entirely composed and finished by Mozart himself. All the others were worked on or composed by Joseph von Eybler and/or Franz Xaver Süssmayr after Mozart's death in 1791.
Some interesting facts and myths about Mozart and this exquisite creation, which led him to his deathbed and was left unfinished, can be read here and here.