using 'natural' deviations
OIRAM Quartertone – East Coast Trumpets
RAPA 4-Valve | LOTUS Trumpets
Jaeger Quarter tone trumpet
Triumph Series Trumpet– Victory Musical Instruments
Quarter-Tone Trumpet Virtuoso Ibrahim Maalouf's Debut in LA—May 21
Marcinkiewicz Co. Inc. - Instruments
Very Rare Schilke B5 4-valve Quarter-tone Trumpet, Gold Plated, Serial 5032 - Trumpet - AliExpress
Quartertone - Van Laar Trumpets & Flugelhorns
This new quarter tone trumpet... - David Monette Trumpets | Facebook
Microtones - The Modern Trumpet by Nathan Plante
Quartertonemarimba.com
Jaeger Quarter tone trumpet
Quartertonemarimba.com
Quarter tone - Wikipedia
RAPA 4-Valve | LOTUS Trumpets
Carol Brass QUARTER-TONE Trumpet Review! CTR-5000H4V-YLT(D)-Bb-SL - YouTube
The Double-Bell Quarter-Tone Trumpet (and more!) - Instrument Demo and Extended Techniques - YouTube
Don Ellis: Trumpet (and Quarter-tone Trumpet) – Essential Trumpet Lessons
Van Laar tromba sib Quartertone Brushed Raw Brass - Raffaele Inghilterra
Quartertone - Van Laar Trumpets & Flugelhorns
Van Laar Quartertone trumpet - YouTube
Double-bell quarter-tone trumpet - Amy Horvey
Bridging Arabic And Western Music With An Unusual Instrument : NPR
The 4 valve microtonal trumpet – DONALD BOUSTED Edition
Jaeger Brass - Finishing up a Quarter tone C trumpet just... | Facebook
