3 Musical Terms Every Musician Should Know Especially if you want to jam or play with other people. 1. Key The pitch center of the song. Important when playing with singers and changing keys. 2. BPM Beats Per Minute. Tells you how fast or slow the song is. 3. Count-In “1, 2, 3, 4” before the song starts. Helps everyone lock into the same groove together. Messy jam starts usually happen because of these. #guitar #musictheory #musician #guitarist #musiclesson