Sound people everywhere rejoiced last year when it was announced that Crystal Castles (aka one of the worst bands in the history of music) were to stop making music together - but it appears that that joy has been short-lived as Ethan Kath, one-half of the electronica duo, has just released a new song.

It seems that the move hasn't gone down well with his former bandmate Alice Glass - who left the band last October - after Kath released the new song, 'Frail', with a bitchy statement referring to her as 'my former vocalist'.

"I think it can be empowering for her to be in charge of her own project," it read, referring to Glass's prospective solo career.  "It should be rewarding for her considering she didn't appear on Crystal Castles' best known songs, (she's not on 'Untrust Us'. 'Not In Love', 'Vanished', 'Crimewave', 'Vietnam', 'Magic Spells', 'Knights', 'Air War', 'Leni', 'Lovers Who Uncover', 'Violent Youth', 'Reckless', 'Year of Silence', 'Intimate', '1991', 'Good Time', 'Violent Dreams' etc.). People often gave her credit for my lyrics and that was fine, I didn't care."

In a series of angry tweets (below), Glass responded by calling Kath 'manipulative'.