What is the fine-grained topic of the following text: The sweet-toned Netherlands Female Youth Choir, backed by subtle string chords, joins Hampson in a buoyant “Ständchen” (Serenade), D. 921, not to be confused—as the liner note does—with the posthumous and better-known “Ständchen,” to a different text. Only return the topic.
Netherlands Female Youth Choir's performance of “Ständchen” D. 921 with Hampson