Saw this on The Oldies Music Board, which is a great place to visit if you like 60s and 70s music. 

Sad to hear of the death of Helen Reddy, whose iconic "I Am Woman" was the beginning of a string of big hits in the 70s. Her biopic was front and centre at least year's Toronto International Film Festival. She was 78 and suffering from dementia.

Helen Reddy, Voice of the Feminist Anthem ‘I Am Woman,’ Dies at 78

And Mac Davis, a singer/songwriter/actor whose biggest hit was "Baby Don't Get Hooked On Me" but who wrote a slew of hits for Elvis Presley during his 70s comeback, also passed away after complications from surgery. He was also 78. 

Mac Davis, Iconic Artist & Elvis Songwriter, Dies at 78