The original Four Freshmen quartet, accompanied by Billy May's big band, sings an upbeat jazz tune "Whistle Me Some Blues." Although the video venue is British trains, the combination of sight and song are fine.

http://www.youtube.com/watch?v=rOKphDqRMPw

Sloan

P. S.: I seem to recall some rail museums have augmented trains rides with barbershop quartet singing. I would think that mix would give the museum and the barbershop group(s) a mutually beneficial entertainment option for patrons.