Sia loves working with Adele, even though the songwriter-cum-pop-star is now taking a few of the songs she wrote for the 25 star for her new album. But it seems like the advice is the best part of the experience. As a charmingly fully-wigged Sia explained on The Graham Norton Show, Adele told her that the key to going on tour lies in making the audience do the high note for you. Side note: Can Sia and Adele go on tour together? Or would that be too much intimidating talent for one venue to handle?