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IDKHOW only had FOUR songs on spotify up until 3 weeks ago, their entire popularity is built off of touring.
Here's a video of an entire concert from over a year ago, when they only had ONE song on spotify which had released less than a month earlier. It's a small venue, but you can tell from the screaming and singing from the crowd that the place must be packed. If you listen to the music, the majority of the sound is coming from dallon and ryan. Ryan uses tambourines, as well as the drum and dallon uses a uke in one or two songs when he is not using the bass.
Tyler uses a uke, a bass in ONE song, and the piano. Josh I think only plays the drums. Yes, twenty one pilots has one more important instrument in their shows that Tyler actually plays live, that being the piano, but their songs are usually BASED on the piano. All of the songs IDKHOW plays are based on the bass or uke. The piano is really the only important instrument present in their songs that could be played live, which they chose not to. Yes, most songs feature the guitar, but it is mostly drowned out by the bass, which is the center of the vast majority of their song, along with synthetics.
BTW lights go down, and Mr. Sinister are two of their original unreleased songs and are played in that video of the concert if anyone wants to listen to them