R-n-B music expert? Help identify this song in the movie.

Does someone recognize the R&B song that started to play when Ben was studying for his chemistry final exam, just before he started the dream with the professor writing on the chalkboard.

Here are my guesses at what the words are.

"... Spend it all, but have not... Money, we make... the more we see..."
But I cannot find the lyrics on the web as the words as I am guess the lyrics and the words are too common. It has that 70's 80's Bill Withers kind of groove to it. But the voices are much higher than Bill Withers. Maybe Earth Wind and Fire?

If you knows this song, please tell me the title or artist.

Thanks!