There is more than one artist with this name, including:
1) 3's a Crowd was a Canadian folk band formed in 1964 in Vancouver;
2) 3's a Crowd was a 1960s American garage rock band from Illinois.

1) 3's A Crowd was Canadian a folk rock band which formed in 1964 in Vancouver, British Columbia . Before splitting in 1969, a wide range of Canadian musicians passed through its ranks who would later establish successful music industry careers of their own, including Bruce Cockburn, Colleen Peterson, and Brent Titcomb. The band's original lineup consisted of Donna Warner, Trevor Veitch, Brent Titcomb (vocals, guitar), Richard Patterson, David Wiffen, and Comrie Smith, who was later replaced by Buffalo Springfield and Neil Young compatriot Ken Koblun from Winnipeg. The group released one album, which was produced by Cass Elliott.

2) 3's a Crowd was a 1960s American garage rock band from Illinois. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.