Passage: Following their first tours in the early 1990s, Tool has performed as a headline act in world tours and major festivals such as Lollapalooza (1997 and 2009), Coachella Valley Music and Arts Festival (1999 and 2006), Voodoo Experience (2001 and 2016), Download Festival (2006), Roskilde Festival (2001 and 2006), Big Day Out (2007 and 2011), Bonnaroo (2007), All Points West Music & Arts Festival (2009), and Epicenter (music festival) (2009). They have been joined on stage by numerous artists such as Buzz Osborne and Scott Reeder (bassist) on several occasions; Tom Morello and Zack de la Rocha during their 1991 tour; Layne Staley in Hawaii, 1993; Tricky (musician), Robert Fripp, Mike Patton, Dave Lombardo, Brann Dailor of Mastodon (band), and experimental arts duo Osseus Labyrint during their 2001–02 Lateralus tour; and Kirk Hammett, Phil Campbell (musician), Serj Tankian, and Tom Morello during their 2006–07 tour. They have covered songs by Led Zeppelin, Ted Nugent, Peach (band), Kyuss, the Dead Kennedys, and the Ramones.
How many bands has Tool covered songs by? How many bands have they covered that are listed? How many different bands and singers has Tool covered? How many festivals did Tool perform at before the year 2000? How many festivals did Tool perform at in 2006? How many headline acts in world tours and major music festivals did Tool perfom in 2009? How many times did Tool perform at Lollapalooza? How many years after first performing at Lollapalooza did Tool then first perform at Coachella Valley Music and Arts Festival? How many years after first performing at Voodoo Experience did Tool perform there again? How many years apart was the second performance of Tool's at Coachella Valley Music and Arts Festival than the performance at Bonnaroo? How many years apart were the two festival performances at Big Day Out? How many years into the 90's did Tool perform their first festival? How many years was the time span from the first time to the second time where Tool performed at Lollapalooza? What band did Tom Morello and Zack de la Rocha join onstage during their 1991 tour? What three world tours and music festivals did Tool perform as a headline act in 2009? When did Tool perform at three festivals in a single year? Where did Tool perform first, Bonnaroo or Coachella? Where did Tool perform first, Roskilde Festival or Big Day Out? Where did Tool perform first, Voodoo Experience or Coachella? Where did Tool perform first, Voodoo Experience or Lollapalooza? Which festivals did Tool perform at in the 1990s? Which festivals did Tool perform in twice? Which festivals did Tool take more than 6 years to return to? Which occurred first, the performance at Epicenter or Download Festival? Which two festivals did Tool perform at in 2006? Which two festivals did Tool perform at in 2007? Who performed with Tool during their 2001-02 Lateralus tour, Robert Fripp or Tom Morello? Who performed with Tool first, Mike Patton or Zack de la Rocha?