Focused, intelligent slow practice (long tones, intervals, scales, melodic studies) will positively influence all aspects of our playing. Endurance, intonation, flexibility, and even technical facility will all benefit. There are a number of proven methods that feature long tones, such as the contributions of Carmine Caruso, and the popularity of such approaches is because they work! I like to focus on two classics, J.B. Arban's "Complete Conservatory Method" and Max Schlossberg's "Daily Drills" for a structured and progressive program of long tone, interval, and scale practice.
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