Why are named drum patterns important in Noh music?

In Noh music, named drum patterns are essential because they provide a structured, logical framework for the performance, allowing for both prediction and anticipation of the musical progression. These patterns, known as tetsuke, function as horizontal time units that support the vocal line and help organize the rhythm, which is often highly elastic.1

The importance of these patterns is rooted in several key functions:

• Structural Logic: Similar to the role of chords in Western music, these stereotyped patterns follow specific rules regarding which sequences may precede or follow one another, creating a sense of coherent musical development.1
• Performance Coordination: The patterns are defined not only by the drum sounds themselves but also by the drummers' vocal calls, or kakegoe. These calls are vital for signaling and controlling the timing of beats, helping the ensemble maintain synchronization despite the complex relationship between the vocal line and the instrumental accompaniment.1
• Unique Identity: The combination of specific drum strokes and kakegoe gives each pattern a distinct aural image, which is fundamental to the recognition and execution of the music.1