As an optional exercise, try to play your G major scale / melodies over the C major backing track. You’ll notice that you’ll be playing in a mode other than Ionian (i.e. “the” major scale).
Just tried that. Sounds OK to me. What’s the mode called that you mention?
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It’s called the Lydian mode. Compared to the “normal” major scale, its 4th degree is raised by a semitone. C Lydian has the notes C D E F# G A B which are the same notes as those in the… G major scale 
Of course, modes are about much more than a bunch of notes in a certain order. You can read more about them here if you are interested, but there’s no need to rush to understand and apply it all right away.
Thanks for that. As I said in another pots you learn sonneting new everyday.
To be honest I hadn’t even considered modes at this point as they seem like e very big topic. Thanks for the link though.
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That’s true, modes seem to be a world unto themselves. I’m still only scratching the surface myself, but the whole topic seems very interesting.
I’m wondering if the F# of the G major scale and the F of the C major scale of the backing track will clash? It seems to me the backing track should be in C lydian as well, for everything to sound harmonious?
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Fair point, I did not think about that.