Roger,
I have the luxury of being retired, and I have my euphonium and tenor and bass trombones sitting in their stands in my music room, always "at the ready". So, the first playing I do on any day is a warmup routine. Long tones, slurs, scales and the like. If I am working on a solo or a gnarly piece of music, I go to that after warming up. Later in the day, I will usually come back to my horn(s), do a brief re-warmup, then work on some aspect of my playing I want to improve, increase, develop, etc. If I am not working on any particular piece of music, I will go to this directly after my first warmup routine.
I have found that it is best to tackle the most difficult piece you are working on early in a practice session, rather than saving it for last when you might be getting tired. In working on just exercises and drills, I think this is also true. There is a sweet spot in my practice routine where I probably sound the best and am technically sharpest. For me, this happens after I am fully, fully warmed up and have been working on a piece of music or an exercise. It is usually 30 minutes or so from when I first pick up my horn. At this sweet spot I will play my toughest piece or most technical exercise.
I don't necessarily vary the order of exercises each day, but rather focus on the harder things early or the things that I really, really want to improve on. I also don't wait until the very end of a session to work on my upper range. I am careful how I do upper range stuff in any session or on any given day in that I don't want to trash or wear out my chops before I get done with all the particular things I want to work on.
If there is a very particular exercise or technique that I am working on, for instance, triple tonguing, I will put this early in any practice session, then probably repeat it later in the session. In fact, I am right now working on something where I want my triple tonguing to be as fast as possible, so I do exercises for this multiple times throughout my practice session. If I were to spend the whole session doing the tonguing, then after a while it would be, how do they say it on Star Trek, futile! Your tongue would just start shutting down. So, using the tonguing as an example, it seems you cannot spend a whole session in one area. Playing chromatic scales is another example. I play those every day at some point, and I will spend a few minutes doing various chromatic exercises. But when I play those very fast for a while, my fingers get tired and a little painful actually. So, I can only do those for so long. This is another example of where I might do some aspect multiple times in a session for a short time each occurrence.
When I stop and really think about how I approach playing and practice over time, I am probably not as regimented as the above might suggest. I sometimes just do whatever the heck I feel like at any given moment on any given day. But if I am trying to be very serious about my practice time, then I do try to put some order and regimentation into my practice sessions.
John Morgan
The U.S. Army Band (Pershing's Own) 1971-1976
Adams E3 Custom Series Euphonium, Wessex EP-100 Dolce Euphonium, 1956 B&H Imperial Euphonium
Adams TB1 Tenor Trombone, Yamaha YBL-822G Bass Trombone
Wessex TE-360 Bombino Eb Tuba
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