[Walt.]

So many favorites... long time favs would be:
Beatles
Hollies (click up Write On on youtube for a great non-hit)
Four Seasons
The Searchers
CCR
on any given day the Kinks, Seekers, Ventures, could be in the list.
An obscure (in U.S.) group to check out is Dave Dee, Dozy, Beaky, Mich and Tich. Great tunes in mid-late 60's. Many of their songs on Youtube.
Never liked the Rascals except for "I Ain't Gonna Eat Out My Heart Anymore."