Have you watched The Wrecking Crew documentary about the studio musicians who performed on many of the classic hits of the 60s, including Wichita Lineman? Fascinating insight into the music biz in its heyday.
Glenn Campbell was a member of the Wrecking Crew and appeared on many Beach Boys hits in the '60s. He was an incredible guitarist, which many people don't realize. Same with Muscle Shoals "Swampers". To quote Lynyrd Skynyrd, "now, Muscle Shoals has got the Swampers". They played on everything, including Aretha Franklin hits.