Also known for his collaborations with Jimi Hendrix, Eric Clapton, Stephen Stills, Jeff Beck and Linda Ronstadt, he announced last year that he'd been diagnosed with metastatic melanoma, and launched an appeal to raise funds for expenses surrounding his treatment.

Greenspoon said at the time: "I started having strange visions and sensations. My wife took me to the hospital where a CT Scan revealed a brain tumour.