Not even a melody of the classical genre, but rather a musical reprise with length in 0:38 only. It runs through our ears faster than we are able to realize that it was an independent composition, not a part of something else. About 10 people took out to fulfill it. Probably, even more because some instruments sound strenuously that is created only if there are multiple of the same instruments involved.
Reference: Nick Urata - Free Listening on SoundCloud