Hello Form.

I was listening to the album "Diana Ross and the Supremes sing and perform Funny Girl" and as I was listening to the track "I'm the greatest star" I heard the strangest thing.

As I was listening to the track, I noticed that the vocals switched from The Andantes to The Supremes continuously throughout the song. On the youtube video, at around 3:32 seconds, I heard a very familiar voice of Florence Ballard with Mary Wilson as they sang the line "Have you guessed yet, who's the yet?"

[[https://www.youtube.com/watch?v=rqsj61RVPEY: Link to "I'm The Greatest Star)

I initially thought that they were the voices of the Andantes, however after replaying the song I noticed that these vocals sounded a bit different than the vocals of the Andantes or of Cindy Birdsong.
I believed that these recording sessions all happened in 1968. I looked on the Diana Ross timeline website [[http://dianarosssupremes.free.fr/Timeline%201967.htm)
and on the date of September the 6th 1967, it says that there was a photo session for the "Funny Girl" albums cover.
This would mean that the album was in the works by September of 1967.

I did further research on the 1968 film staring Barbara Streisand and according to a 1967 article I obtained on website Newspapers.com, from the publication "The News and Observer" [[North Carolina), it states that Streisand had already began filming by June of 1967.

I understand that The Supremes were performing in Los Angeles at the Coconut Grove in June of 1967, I also understand that they would often record songs in Los Angeles as-well. Could there be a possibility that they recorded this track during the time of their engagement at the Grove in 1967 ?