I have discovered a great site for finding out what key a particular tune is in. E-CHORDS This site has hundreds of popular tunes all worked out and usually at the top is primary key for the tune.
This link E-CHORDS shows you the chords for Beyonce’s Crazy in Love. So hook up your Skoog, select the G minor pentatonic and start making music with Beyonce!
I discovered the site when doing some training in north lanarkshire a couple of weeks ago. I was illustrating how you can use the pentatonic settings in the skoogmusic software to play along with your favourite tunes, “play some Beyonce then” was the call and quick as a flash we were up and running. Also had a crack at Balck eyed peas ‘I gotta feelin’ which is good fun too. LINK HERE
Enjoy!

