JOHN Mayer and Demi Lovato have been swapping compliments on the popular social networking site Twitter. Mayer, 31, had recently confessed on the website that he could not get the tune of Demis latest track La La Land out of his head. I have 'La La Land by @ddlovato stuck in my head. Actually, its not stuck. Im choosing to sing it. B section is sophisticated, People magazine quoted him as saying. An honoured Demi replied: That is quite possibly the best compliment Ive received in this business. Thank you so, so much Mayer added: Youre going to make lots of records, I can tell, and Write one song at a time and never, ever apologise for any of them, ever. And Demi said: See, thats exactly what I needed to hear today. If thats not inspiration, then I dont know what is. TOI