Complex sentence: Acoustically, the choice of a clarinet, violin, and piano is characteristic in that most chamber music (and most music in general) contains high (soprano), mid-range (alto/tenor), and low (bass/baritone) parts.
Split into simpler sentences: Acoustically, the choice of a clarinet, violin, and piano is characteristic. Most chamber music (and most music in general) contains high (soprano), mid-range (alto/tenor), and low (bass/baritone) parts.