Bands like The Drifters, The Temptations, The Embers, The Tams, The Four Tops, The Chairman of the Board, Maurice Williams and the Zodiacs.
Quite a few of these bands had Motown careers (The Temptations obviously) in addition to music they wrote and arranged as 'beach music' and some crossed over.
Stax and Atlantic Records were major labels for beach music.
Some famous beach tunes:
Carolina Girls – General Johnson
With this Ring – Platters
I Love Beach Music – Embers
My Girl – Temptations
Sixty Minute Man – Billy Ward
Under the Boardwalk – Drifters
Miss Grace – Tymes
Summertime is Calling Me – Catalinas
Myrtle Beach Days – Fantastic Shakers
What You Do To Me – Embers
39-21-46 – Showmen
You’re More Than a Number in My Little Red Book – Drifters
Be Young, Be Foolish, Be Happy – Tams
She Used to be my Girl – O’Jays
Build Me Up Buttercup – Foundations
Girl Watcher – O’Kaysions
Some Kind of Wonderful – The Band of Oz