Shades of Blue was a one-hit wonder American blue-eyed soul group in the mid-1960s. Known for their hit single "Oh How Happy," the band's style was characterized by rich vocal harmonies, reflective of the Motown sound that was popular during their peak. Despite their brief stint in the spotlight, their music, particularly their signature hit, has had enduring appeal, frequently appearing in various film and TV soundtracks. The group's members changed frequently, with Nick Marinelli being the only consistent member.