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Jimmy Greenspoon, best known as the keyboard player in the rock band Three Dog Night, died Wednesday of metastatic melanoma, which he had battled for the past five months, at his home in North Potomac, Maryland. He was 67.

Greenspoon joined Three Dog Night in 1968 and continued playing with the band until recently. Three Dog Night is best known for the 1970 hit “Joy to the World (Jeremiah Was a Bullfrog),” and had 21 Top 40 hits between 1969 and 1975.

The band paid tribute to Greenspoon on its Facebook page on Wednesday.

“We are very saddened at the passing of our dear friend and longtime band mate, Jimmy Greenspoon,” the post reads. “Jimmy died peacefully at home today surrounded by his family. Please keep him and his loved ones in your prayers and your hearts.”

Greenspoon was born in Los Angeles and raised in Beverly Hills.