Jimmy Greenspoon (1948-2023) was an American musician best known as the keyboardist for the rock band Three Dog Night. Formed in 1968, the band became famous for their unique blend of rock, pop, and R&B, characterized by powerful vocal harmonies and catchy melodies. Greenspoon's contributions were integral to the band's sound, particularly through his work on hits like "Joy to the World," "One," and "Mama Told Me (Not to Come)." Three Dog Night achieved significant commercial success, with 21 Top 40 hits in the late 1960s and early 1970s, making them one of the era's most popular bands. Greenspoon's keyboard work and arrangements helped define their style, which included a mix of original songs and covers of works by other songwriters. Beyond his work with Three Dog Night, Greenspoon was involved in various musical projects, including collaborations with other artists and performing in different genres. His legacy lies in the band's enduring popularity and influence on the rock genre, as they helped bridge the gap between rock and pop, paving the way for future bands. Greenspoon's contributions to the music industry have left a lasting impact on listeners and musicians alike.