I'll assume it's a studio recording http://www.superseventies.com/1970_3singles.html
"Their first album release was, as before, built around Motown gold. The band decided to reinterpret "Get Ready," which had been a Top 30 hit for the Temptations in 1966. On July 4 at 1 a.m., Rare Earth began recording, and when they were through, they had stretched the song to twenty-one and a half minutes. It took up the entire second side of that first album, issued in the fall of 1969."