Ashton Irwin (5 Seconds of Summer)

Ashton Irwin, drummer for 5 Seconds of Summer, often writes songs out of necessity. While he likes to journal, Irwin finds songwriting a much more effective vehicle for maintaining his mental health. And there's a routine to the songwriting process: from 11a-3p when the caffeine is at its peak, with a Moleskin journal and a black ink pen.

Irwin likes to write lyrics during the day; the songs he writes at night are different. "I’m less concerned with being tricky with the wordplay," he explains. "The songs I write at night are more beat driven and animalistic, conjuring the energies of the night."

Irwin's latest solo album, his second, is called Blood on the Drums.