The CD stand was in the corner of the room, so full that she'd had to pile up some of the cases on the floor beside it. She scanned the rows until she found something that took her fancy* and popped the disc into the player. Mozart's Requiem. [if you're having her looking like this, then I'm sure she'd also pay attention to the conductor] The first movement, the Introitus, [it just means "opening"] pushed [for myself I'm not sure that gives the right feel, but I'll leave that for you] [quietly] [don't think it's right here, as it's only quiet at first -- you need it after the colon when describing the opening bars] through the speakers: the bassoons sombre, distinctive, under the strings, [first, then the violin and cello,] [no -- they all start together, and though her ear might be good enough to distinguish the violins from the cellos I doubt she'd think of them as individuals, would she? I think we need Chris p's ear here to describe the relationship between the strings and woodwind -- my idea is just a placeholder until you get something better] the chords [um... Chris might point out we've got that wrong, as we were using "chords" in a non-technical way...] low and unsettling but becoming more dramatic as the brass [instruments] came in, then the powerful voices of the choir. She closed her eyes and let the music take her [, listening to the timpani and then the powerful voices of the choir]. [although the timpani does come in first, it's a scarce half-bar, so "listening" isn't right]
*this is crap and needs rewording. I'll let you fiddle with that bit!