+**Bb1** refers to the musical note B-flat in the first octave, situated below middle C. On a standard 88-key [piano](/wiki/piano), it is the lowest B-flat, resonating at a fundamental [frequency](/wiki/frequency) of approximately 29.14 Hz and providing a deep, foundational tone.
+## See also
+- [B-flat](/wiki/b-flat)
+- [Musical Note](/wiki/musical-note)
+- [Octave](/wiki/octave)
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