Originally released on their fourth studio album Naturally in 1970, it was re-released as a single in 1971, topping the singles charts in the USA. It was certified gold by the RIAA within two months, and has since been covered by multiple artists. Unlike most Three Dog Night songs, it featured all seven members of the band singing instead of just the three main vocalists. It was ranked by Billboard magazine as the #1 pop single of 1971, and went on to sell 5 million copies worldwide, making it one of the best-selling singles of all time.
The only difficult chord for beginners in the song itself is Bb. However, it starts with the C C# D sequence that is best barred at frets 3, 4, 5 or 8, 9, 10. A nice touch for those who can manage it is to insert the bass line D - C - B - Bb as indicated by the notation D/C (D chord with a C note in the bass), G/B (G with B bass) and D/A (D with A bass): D - D/C - G/B - Bb - D/A.