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People usually tend to overlook the contribution made from the Los Angeles studios in house musicians 'The Wrecking Crew'.

Apologies for copy pasting wiki here;

The Wrecking Crew was a nickname (coined by the drummer Hal Blaine after the fact) given to a group of session musicians in Los Angeles, California, who earned wide acclaim in the 1960s. They backed dozens of popular singers, and were one of the most successful "groups" of studio musicians in music history.

The Wrecking Crew's members typically had backgrounds in jazz or classical music, but were highly versatile. The talents of this group of 'first call' players were used on almost every style of recording, including television theme songs, film scores, advertising jingles and almost every genre of American popular music, from The Monkees to Bing Crosby. Notable artists employing the Wrecking Crew's talents included Bobby Vee, The Partridge Family, The Mamas and the Papas, The Carpenters, John Denver and Simon and Garfunkel.

The figures most often associated with the Wrecking Crew are producer Phil Spector (who used the Crew to create his trademark "Wall of Sound"), and Beach Boys leader Brian Wilson, who utilized the Crew's talents on many of his mid-60s productions including the songs "Good Vibrations" and "California Girls" and the acclaimed album Pet Sounds.