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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If you intend to integrate also other audio formats, such as FLAC, MP3 or WAV, I recommend the use of libsndfile, which supports all of these formats with a uniform interface.
For playing MIDI files, I suggest FluidSynth. You can load a sound font into it and then either play back an existing MIDI file or programmatically send MIDI commands to the library.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.