NSynth is a dataset made of one-shot instrumental notes. The dataset contains 305,979 musical notes that have a unique pitch, timbre, and envelope. The sounds in the dataset were collected from 1006 instruments from commercial sample libraries. The sounds were annotated based on their sonic qualities, source (acoustic, electronic, or synthetic), and instrument family (bass, brass, flute, guitar, keyboard, mallet, organ, reed, string, synth lead, and vocal).