There are at least three artists using the name Etiquette:

1) Dan and Dave from End of Radio, Orders of the British Empire and OneOfUsCannotBeWrong started a new fidgety, math, post-hardcore band with their mate Brian. Brian is a nice lad.
http://etiquetteareaband.tumblr.com/

2) Female fronted Folk Punk on Plan-It-X Records.

3) A Canadian synthpop / dreampop group made up of Julie Fader, Graham Walsh (also of Holy Fuck), Andrew Roy, and Dean Stone. "Etiquette marks the moment where all their experience and aesthetics intersect into a swirling, seductive sound that perfectly complements Fader’s personal songwriting with Walsh's command of otherworldly, future-shocked sonics."
http://handdrawndracula.com/artists/etiquette/ Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.