Answer:
I believe the answer is "Diana Ross"
Step-by-step explanation:
Diana Ross emerged as the front woman of the Supremes and later left to build a solo career as a singer and actress. She continued her success by reaching #1 with “Ain't No Mountain High Enough.” Following that, she had three other tracks reach #1 in the '70s as she was also branching out and acting.
Hope this helps :)