I would like to take every single band director that has ever insisted on 4-bar phrases and force them to play The Ride on tuba at volume using 4-bar phrases. Gene Pokorny doesn't do it. Alan Baer likely doesn't do it. There are precious few tuba players that
can do it and make it sound good.
But it's a lot easier to teach 4-bar phrases (since a TON of western music lies quite nicely in 4-bar phrases) than it is to teach the concept of musical breathing.
Itreallyreallysuckstotrytoreadasentencethathasnobreaksorpunctuationandjustgoesonandonandon...
Same with music. Just as there is a certain rhythm in speech, with breaks and pauses regardless of the need for breath, music has those same requirements. If you listen to music as a language, you clearly hear the periods, commas, semi-colons, etc.
The only justifiable reason to play a 4-bar phrase is that the music makes it an imperative. And I could probably count the number of times I have encountered such a musical imperative on one hand (excluding 20-bar sustained whole notes...). A musical imperative leaves no possibility for interpretation. And that is what we do: interpret.
Breath is a vital tool in interpreting music. You wouldn't try to repair a car without the proper tools. Why would you try to play music with one of the vital interpretational tools purposely removed from your toolbox?
Think Fountains of Rome...Is there anyone that
doesn't breathe between the half note and quarter note each time it descends down to the low E in that low register? If you don't you lose support very rapidly. But it fits if you keep the musical line in the forefront of what you are doing.
In an interview on the CSO web site, Gene Pokorny makes the point that there are times when a tubist is moving upwards of 140 liters of air a minute through the horn. The math tells us that 140/60 sec. = 2.33 liters of air per second. With a huge 7 liter vital capacity, that translates to a full breath every 3 seconds if you are playing flat out and completely emptying your lungs before each breath. Now, the vast majority of players don't even have a ticket to the 7-liter ballpark. Most are between 4 and 6 liters. There isn't a snowball's chance of making it 4 bars.
I guess the best way to say it is;
when you breathe often isn't as important as
how you breathe in terms of musicality.
Breath often.
Breath big.
Breath musically.
And Chuck is correct...the Remington long tone exercises are intended to have a breath between each note, although I had a teacher have me breath every other note until I hit low G, then every note down to pedal C.
And as far as physical exercises go, I prefer swimming. The water pressure on your torso makes it harder to inhale. It's like ankle weights for your lungs. Also much easier on my crumbling old knees...
http://www.cso.org/main.taf?p=15,1,4,1#gpokorny - Pokorny interview...scroll down and wait for it to load.