This is a jazzy disco song with female vocals with deep bass, rhythm guitar, trumpets, and '70s-style keyboard playing. Is it "If You Wanna See the Sunshine" by Ubiquity from 1978? The lyrics are:

"If you wanna see the sunshine, then you better, you better make up your mind, you better, you better make up your mind. ... 'Cuz life ain't here to jive around, if you wanna see the sunshine, if you wanna see the sunshine... so we can see a brighter day...sunshine, sunshine, sunshine... and when you get together, then why well don't you make up your mind..."