Here are "a couple" of great band from the 70's-ish
Thin Lizzy - The Boys Are Back In Town
http://www.youtube.com/watch?v=1FmPhJkdTwU
T.L. was a Dublin based hard rock band that had a few hits but never made it big sales-wise. You might have heard Metallica's version of Whiskey In The Jar: A rip-off of the T.L. version. Also, Gary Moore saw his career shoot to the sky while playing in this band.
Undertones - Teenage Kicks
http://www.youtube.com/watch?v=wAtUw6lxcis
A relatively unknown band (also Irish) with a very well known hit. The group was easily recognizable by the lead singer's tremolo voice.
The Boomtown Rats (Bob Geldof's old band) - I Don't Like Mondays
http://www.youtube.com/watch?v=POl4vFp-5os
(tragically relevant) Another slightly unknown band (Irish as well) that wrote this song after a school shooting, where the killer said she did it because she didn't like Mondays.
And last, probably among my top 3 favourite bands (and to end on a happy note)
Toy Dolls - I've Got Asthma
http://www.youtube.com/watch?v=FQhGXE5Q_pY
A UK (Sunderland) band formed in '79 and still going strong. One of the pioners in "silly punk". Mind you, the guitarist/lead singer soon got to be one of the finest guitarist around, although you may not think much of his playing here
EDIT: I'll throw in this audio by Yat-Kha, a Siberian throat-singing/western rock group. It's just about the best tune I've ever heard
http://music.yat-kha.com/Bootleg/Yat...otleg_ahoi.mp3