I have read many questions on how to improve range. They say to practice more often, but they don't say how to practice. In addition, a lot of suggestions say to play lip slurs, intervals, or hold out a note with good tone for as long as possible, but they don't follow up. Concerning lip slurs or intervals, some suggestions are to play to the highest note you can. I can figure that you should just start over from the bottom when you hit the top, but how many times, and for how long? Furthermore, I've seen two exercises in a book that focused on tone quality and intonation. One was "How long can you play this exercise with one breath?" It was simply five tied G whole notes (in the staff). There was no suggested tempo; you just held it out. The other exercise also asked how long you could play with one breath, but it consisted of the following: G-F-E-F-G; tied whole notes, at the lower half of the staff. The suggested tempo was quarter note equals fifty. What I did for the two aforementioned exercises was play each five to ten times with a tuner, attempting to keep the pitch centered. However, concerning lip slurs, I just play at 50-80 bpm and go up chromatically. I usually peak around A above the staff. I'm not tired or fatigued, but the A comes out as a G. Then I just start over. Finally, when I try to play notes above the staff, (A<), they just don't come out. Once again, I'm not tired, but I'm just closing off, as my director says. I've focused on improving this but I can't move air fast enough. However, towards the end of a song I play in symphonic band (El Palomino Noble by Joseph Compello), my embouchure is too tired to finish the song. I take the notes down an octave for the last few measures, but my director is irritated because I am capable of playing the entire song, but towards the end, I'm tired and just start closing off.