John Travolta remembers Olivia Newton-John

Fans, friends and co-stars are respecting Olivia Newton-John

The adored vocalist and "Oil" entertainer passed on at age 73 

Albeit a reason for death wasn't uncovered,

Newton-John had battled bosom disease for quite some time.

Among those offering recognition via web-based entertainment 

"Truly miserable to catch wind of the death of Olivia Newton-John. 

My most memorable genuine crush as a youngster.

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