Yes. "Island In The Sun" by Weezer is officially confirmed for the Stage Tour setlist.
Setlist record
This is named song #7 in the wiki's announcement-order database. It entered the public list in Setlist Reveal #1 on 2026-06-10, alongside "RATATATA" and "Get The Funk Out" and "Square Hammer" and "Mimi's Delivery Service" and "Dani California" and "Terminator Oscillator".
Reveal and genre context
Reveal #1 added 7 named tracks. Within the 25 songs announced so far, "Island In The Sun" is one of 9 records classified by this wiki as Alternative Rock. Genre is an editorial browsing label, not an official chart attribute.
Gameplay
Stage Tour supports Lead Guitar, Groove Guitar/Bass, Drums, Vocals, PC Keyboard and gamepad. The official announcement has not published this song's chart difficulty ratings or per-instrument chart details.
Related songs
Official source
FAQ
Is Island In The Sun in Stage Tour?
Yes. It is marked Confirmed because it appears in an official Stage Tour Newsroom setlist reveal.
What difficulty is it?
Its per-instrument difficulty has not been announced.