The soul artist left a permanent mark on the music industry with his contributions to the group The Foundations, defining '60s pop.

RIP Clem Curtis never forget your smile, laughter and that magical voice. Absolute pleasure to have known you mate #foundations #legend

— JaguarFootyTips (@JaguarsTips) March 27, 2017

Colin Young, who took over for Curtis in 1968, has yet to publicly comment. Young was the lead singer of 'Build Me Up Buttercup.'

Clem Curtis continued his music career up until his struggle with cancer diagnosed earlier this year. He has received many farewell messages and will live on through the legacy of his charming music.

I'm saddened to hear of the passing of a dear friend....Clem Curtis. Clem was the original lead vocalist with The Foundations (best known for the classic hits "Baby Now That I Found You" & "Build Me Up Buttercup"). I was fortunate enough to be asked by Jimmy James to join himself and Clem Curtis for a summer season of their hit show "Soul Explosion". Both men were a pleasure to work with. I'll never forget Clem's laugh and cheeky grin. I had a wonderful time working with him (and Jimmy of course) and those memories will remain with me forever. My deepest sympathy goes out to Clem's family. R.I.P. #clemcurtis #soulexplosion #jimmyjames #tamekajackson #miltonkeynes #buildmeupbuttercup #nowthativefoundyou

A post shared by Tameka Jackson (@tamekajacksonuk) on Mar 27, 2017 at 3:35pm PDT