Leo picked up his tuning fork, struck it against his knee, and hummed the A. 440Hz. The anchor. He took a breath, locked his jaw into the solfege hand signs, and began.

He stopped. The silence of the library felt heavy. He took a swig of cold water and restarted.

(Cambio a Sol, ahora en Sol mayor) | ♫ ♪ ♩ | ♩ ♩ ♩ | ♪♫ ♩. | ♪ ♩ ♩ ♩ || Sol La Si Do Re Mi Fa# Sol La Si Do Re