According to ARTISTdirect.com current Metallica bassist Robert Trujillo loves Tool:
“My four-year-old boy loves TOOL!” Trujillo told ARTISTdirect.com. “When I take him to school, we’re playing TOOL all the time, so I definitely connect with them. There’s a lot of bass in that group which is nice. They’re a great band for a bass player to listen to. So believe it or not, my son and I are going through a big TOOL phase!”
He added, “I go through these real technical phases, and I listen to bands like MESHUGGAH and MNEMIC. It’s stuff that’s a little bit complex and takes a lot of patience. Lately, I’ve been jamming a lot to our music. I play through the new songs so I can keep fresh and keep them in my head. I can act crazier on stage if I can play them with proficiency.”
Robert Trujillo’s playlist
02. JIMI HENDRIX
03. BLACK SABBATH
Thanks to Oldesch from Toolarmy for the tip.