[Bluenose]

The Rolling Stones song 'You Can't Always Get What You Want' has only 3 chords and one them is a II chord. It goes, for example in C, Cmaj-Fmaj-Cmaj-Fmaj-Dmaj-Fmaj-Cmaj ect. Why does the II chord (Dmaj) work so well when it's clearly outside the key? The II chord contains a sharp 4th (F#). The C maj scale with a #4 is the C Lydian mode so the II chord is a 'borrowed' chord from the Lydian mode. I watched a Rick Beato video on modes (highly recommend his videos) and he explained that when the Lydian mode is used it often conveys a sense of hope or purpose which makes total sense in this context. I find this stuff interesting and I'd be interested in your comments.