The two began collaborating, electronically amplifying folk music to create a style that would eventually be defined as folk-rock.

The band’s first single, a cover of Bob Dylan’s "Mr. Tambourine Man," shot into the top 10 in 1965, sparking a creative momentum that generated hits such as "Eight Miles High," "All I Really Want To Do" and "Turn!

Crosby, instantly recognizable for his signature mane and walrus mustache, also reflected on tackling mortality in the album's closing track.

Though he stepped back from any major touring in the past two years because of his health issues, Crosby remained active in recording music.

A regular presence on Twitter, Crosby often interacted with fans, tweeting Wednesday about topics including the arrest of climate activist Greta Thunberg and his favorite Beatles song ("Eleanor Rigby").

On Thursday, singer Pink told USA TODAY she had just talked to Crosby – a California neighbor – last week about songs he wanted to play for her.