First up is Tove Lo, who pops up on Close, the lusty new single by Nick Jonas. Ignoring the fact she'd eat him alive, their duet is admittedly a firework in a powder keg in a volcano.
You can tell Tove approves of the song as, unlike her recent duet with Years & Years, she bothered to turn up for the video.
Tove Styrke - the more alternative Tove of the two Toves - also appears on a collaboration, in this case with wave-making producer Big Wild.
She's added vocals to his instrumental hit Afterglow and, like Sophie Ellis Bextor on Groovejet, improved the track ten-fold.
Just take the opening lyric: "How cool would it be to have diamonds on the soles of my feet / Cause I've worn these sneakers since I was 13."