Per the Burbank ticketing website, here is the lineup (tier time slots added, groups are listed in order that they appear on the ticketing website):
Advanced Mixed Tier 1:
Kennedy Executive Order
Brea Olinda Masquerade
John Burroughs Powerhouse
Los Alamitos Sound FX
Advanced Mixed Tier 2:
Hart Sound Vibrations
Bonita Vista The Music Machine
Diamond Bar Marquis
Advanced Treble:
Brea Olinda Spellbound
Hart Heartbreakers
Kennedy First Ladies
John Burroughs Sound Sensations
Los Alamitos Soundtrax
Advanced Bass:
Los Alamitos Xtreme
John Burroughs Men @ Work
Hart Unleashed
Intermediate Mixed (session 2):
Carlsbad Sound Express
Los Alamitos Connexion
Hart Hart N Soul
Golden Valley Melodies of Gold
Los Altos LA Dynamix
Intermediate Mixed (session 1):
Norco New Generation
Boulder Creek Broadway Bound
John Burroughs Sound Waves
John A. Rowland Infusion
Oceanside Soundwaves
Intermediate Treble:
Boulder Creek Heart & Soul
Brea Olinda Tiffany's
Diamond Bar Solitaire
John Burroughs Decibelles
Los Alamitos Xquisite
Novice Treble:
Eisenhower Ikettes
Los Alamitos Axcent
Novice Mixed:
Carlsbad Purple Reign
Saugus Blue Heat
Eisenhower HS Ike Singers
MLKHS Legacy
Esperanza Reverberation
Middle School Advanced Mixed:
Luther Starlight
Dolores Huerta Madrigals
Middle School Intermediate Mixed:
Lakeside Aptitude
John Muir Imaginations
Brea Show Choir Express
Walter Reed UpBeat!
Middle School Treble:
John Muir MS - Innovations
Luther Burbank - Spotlight
Oak Middle School – ShowStoppers
Here’s the ticketing site. You can double-check there: https://www.itsmyseat.com/bhs/?fbclid=IwAR2EU7PHmPnV3VHt4YndWFIvl_Fdz3EyC5fF-1X2DjIvybg1inGeXSoehew