John Mayer has sent Rosé of K-pop girl group BLACKPINK a pink electric guitar as thanks for covering one of his songs.On July 16, the Korean-Australian singer took to Instagram to share a few images of her brand-new guitar, which was accompanied by a hand-written note from Mayer. “Rosé! I should be thanking YOU! (so thank you.),” wrote the singer-songwriter.The guitar comes after Rosé’s recent cover of Mayer’s 2006 song ‘Slow Dancing In A Burning Room’ on a South Korean variety show.