Since a few weeks I'm playing in a big band and there's some really high notes in the pieces we're playing. Up to a3 (four lines above the stave). After half an hour of playing in this height, my embouchure is totally exhausted. So I need to improve my endurance. What book is recommended on this subject? I've heard good stories about "Fitness For Brass" (though some say it doesn't really focus on endurance) and "Endurance Drills for Performance Skills" (but I'm not sure it gives any advice; isn't it just a book full of scales and chords?). The most important thing for me is that it shouldn't focus on one little thing, e.g. only mouthpiece buzzing, only the 'pencil trick', only playing scales, etc; it should include various methods.