The five stories in this collection move rapidly. Unlike many short story collections where the reader feels like he can pick and choose stories in no particular order, the stories in Nocturnes feel like they should be read in quick succession in one go. Given their pacing, this seems like a manageable task over a long languorous weekend afternoon. They are written in an easy style and it's rewarding to notice that they contain characters which make multiple appearances.
There are several recurring themes throughout these stories. There are long term relationships that have been strained to breaking point like a tourist couple in the story "Malvern Hills"; people uneasy with fame and success like a man who undergoes plastic surgery in "Nocturn"; and an anxiety about fulfilling one's potential like a houseguest with severely judgmental friends in "Come Rain or Come Shine". The niggling details of life are shown to continuously squander the beauty which music offers. Careers get in the way of musicians trying to realize their artistic vision. Music brings individuals together, but the promises it makes can never be realized because of the circumstances those people find themselves in.
There are moments when these stories tread the line between realism and a hallucinatory dream-like narrative resonant of Ishiguro's masterful experimental novel The Unconsoled (whose protagonist is also a musician). Perhaps this is what Ishiguro is seeking to do: create the kind of inarticulate sensations which music invokes by using a carefully-modulated form of prose. He most definitely succeeds at demonstrating great skill in creating stories which are touchingly beautiful like the opening story "Crooner" and ones which are utterly hilarious and disturbing like "Nocturn". While perhaps not reaching the depth of his more meditative novels due to their intentionally clipped lengths, these stories are nevertheless highly accomplished and very enjoyable.