"Because its beat is perfectly steady, the metronome is an excellent practice tool for musicians. Practicing with a metronome is extremely useful for developing and maintaining rhythmic precision, for learning to keep consistent tempos, for countering tendencies to slow down or speed up in specific passages, and for developing evenness and accuracy in rapid passages. Most music teachers consider the metronome indispensable, and most professional musicians, in fact, continue to practice with a metronome throughout their careers."