Fiona Apple shared a heartfelt, powerful message for her 'hero,' Sinead O'Connor.
Still, she had a hopeful message for fellow sufferers of mental illness.
From subtweets to side-eye to diss tracks, 'beef' is a pop music tradition of the highest order.
Some favorites from the Emerald Isle's finest, including Hozier, Roisin Murphy, The Cranberries and more.
Nothing compares 2 O'Connor's latest allegations.
The Irish icon has been found "safe and sound" since the disturbing note was posted this morning.