I think I've finally got my top 10 disco songs list of all time pinned down. Its a combination of both objective and subjective criteria.
#10. I Will Survive by Gloria Gaynor
A classic song with a message of female empowerment.
#9 Ring My Bell by Anita Ward
Not sure if Anita had any other hit songs but this is her crowning achievement.
#8 Got To Be Real by Cheryl Lynn
To be reaaaal forever echoes in my mind. A stone cold classic by an underrated vocalist.
#7 Love to Love You Baby by Donna Summer
Gotta have the Queen of Disco included. I contemplated including 'I Feel Love' instead but a little too much Italo Disco/Electronic vibe. Call me a purist.
#6 Don't Leave Me This Way by Thelma Houston
A disco remake of the Harold Melvin & the Bluenotes classic. Thelma owned it. Top 3 for me if we are just using subjective measures.