  We present and release Omnizart, a new Python library that provides a
streamlined solution to automatic music transcription (AMT). Omnizart
encompasses modules that construct the life-cycle of deep learning-based AMT,
and is designed for ease of use with a compact command-line interface. To the
best of our knowledge, Omnizart is the first transcription toolkit which offers
models covering a wide class of instruments ranging from solo, instrument
ensembles, percussion instruments to vocal, as well as models for chord
recognition and beat/downbeat tracking, two music information retrieval (MIR)
tasks highly related to AMT.
