There are at least two bands called Gentlemen:
1) An indie-pop duo from Auckland, New Zealand.
2) A 60's garage pop/rock band from Dallas, Texas.
3) An Ireland project.
4) A punk/noise rock band from Australia.
1) Gentlemen is a musical collaboration between singer/writer Thomas Brown and musician Michael Harding, creating charming independent pop. Currently Auckland-based, the pair met whilst courting sisters.
2) Gentlemen were an unsigned garage rock band from the 1960's. Their single "It's A Cryin' Shame" is featured on the compilation Forth Worth Teen Scene Vol. 3.
3) http://gentlemenarego.bandcamp.com/
4) Gentlemen is a punk/noise rock band from Melbourne, Australia.
https://n-w-c.bandcamp.com/
http://newwavecult.tumblr.com/