
Most people work on range by playing scales and arpeggios. Most range books use these because they LOOK good in print. Scales to Double High C LOOK good. Sadly they don't make your range playable in real music.
To play usable high notes, you need to practice music in the upper register.
I looked at a LOT of music for flute, clarinet, piano...
I looked for music that worked on basic trumpet skills but in a register that we don't normally practice those skills.
"The Next Level" is a collection of music that will help teach you to PLAY music in the upper register.
This music will make you stretch out and improve your technique in the upper register and help you to become what MOST lead players are not.
I use this music in my in-person lessons and people are surprised that anyone tries to play this type of music in this register.
Regardless of your current playing level. "The Next Level" will not only challenge you, but it will also guide you to improvement in all areas of the trumpet.

In my book I list all of the possible causes. Here I only listed the top 3.
Weak Stuffy Tone
too little air used
too much pressure
closed throat
Bright Shrill Tone
mouthpiece too shallow
Bad concept of tone
Too tight
Dull Lifeless Tone
Mouthpiece too deep
no tongue arch
wrong concept of tone
Forced Sound
lips too tight
too much mouthpiece pressure
Bad breath support
Weak Upper Register
Chops too tight
too much pressure
wrong or no pivot
Weak Low Register
No or wrong pivot
Mouthpiece too small
not using warm air Haaaaa.
Changing Quality of Sound
poor breath support
change in tongue arch or pivot
tonguing problem
Slow Response
too much pressure
poor breath support
lips too tense
Missed Notes
Mouthpiece Too small or shallow
too much pressure
poor breath support
No Endurance
Too much pressure
No practice
Mouthpiece too big or deep
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