Dateistruktur some_metadata
- selbstredende Bezeichner werden nicht erklärt - 

artist_name
		
title

duration
The duration of a track in seconds as precisely computed by the audio decoder.

loudness
The overall loudness of a track in decibels (dB). Loudness values in the Analyzer are averaged across an entire track and are useful for comparing relative loudness of segments and tracks. Loudness is the quality of a sound that is the primary psychological correlate of physical strength (amplitude).

tempo
the overall estimated tempo of a track in beats per minute (BPM). In musical terminology, tempo is the speed or pace of a given piece and derives directly from the average beat duration

year
release year

artist_latitude
Breitengrad der Künstler"location"

artist_longitude
Längengrad der Künstler"location"

artist_familiarity
Bekanntheitsgrad des Künstlers: Familiarity is an indication of how well known the artist is, while hotness (which we spell as the zoolanderish ‘hotttnesss’) is an indication of how much buzz the artist is getting  right now
(bezogen auf das Merkmal artist_hotttnesss - hier nicht zur Verfügung gestellt!)

song_hotttnesss
algorithmic popularity estimation by The Echo Nest 

artist_id

song_id	

track_id