The Wrecking Crew was a nickname coined by the drummer Hal Blaine after the fact for 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 Nancy Sinatra, Bobby Vee, The Partridge Family, The Mamas & the Papas, The Carpenters, The 5th Dimension, John Denver, The Beach Boys, Simon & Garfunkel, and Nat King Cole.
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 used the Crew's talents on many of his mid-1960s productions including the songs "Good Vibrations", "California Girls", the acclaimed album Pet Sounds, and the original recordings for Smile.
Members of the Wrecking Crew played on the first Byrds single recording, "Mr. Tambourine Man", because Columbia Records did not trust the skills of Byrd musicians except for Roger McGuinn. Further recordings of the Byrds were conditional on the success of the single. All of the Byrds played on their subsequent recordings.
Spector used the Wrecking Crew on Leonard Cohen's fifth album, Death of a Ladies' Man.
A book, Hal Blaine and the Wrecking Crew: The Story of the World's Most Recorded Musician, co-written by Blaine, was published in 1990.
The Wrecking Crew were inducted into the Musicians Hall of Fame on November 26, 2007.
The Wrecking Crew were featured in the 95-minute 2008 film The Wrecking Crew directed by Tommy Tedesco's son, Denny Tedesco. The film has screened at several festivals and was featured on National Public Radio. As of the date of this post, it has not yet been commercially released. -Source: Wikipedia
The Wrecking Crew: the inside story of LA's session giants | MusicRadar.com