Add tempo metadata to your music collection. This script has been rewritten and turned into a new project: http://github.com/lmacken/tempi

tempofinder.py

# NOTE: I re-wrote this code and turned it into a real project:
# http://github.com/lmacken/tempi

# tempofinder - Add tempo metadata to your music
# ==============================================
# Sign up for an EchoNest API key: https://developer.echonest.com/docs
# sudo yum -y install python-virtualenv python-eyed3
# virtualenv env
# source env/bin/activate
# pip install pyechonest
# export ECHO_NEST_API_KEY=
# export ECHO_NEST_CONSUMER_KEY=
# export ECHO_NEST_SHARED_SECRET=
# python tempofinder.py <directory of music>

import os
import sys
import eyeD3

from pyechonest import song

EXTENSIONS = ('mp3', 'flac', 'ogg')


def get_tempo(artist, title):
    results = song.search(artist=artist, title=title, results=1,
                          buckets=['audio_summary'])
    if len(results) > 0:
        return results[0].audio_summary['tempo']
    else:
        return None


def process_music(library):
    for root, dirs, files in os.walk(library):
        for filename in files:
            if filename.split('.')[-1] in EXTENSIONS:
                full_path = os.path.join(root, filename)
                tag = eyeD3.Tag()
                try:
                    tag.link(full_path)
                    bpm = tag.getBPM()
                except Exception, e:
                    print("Error: %s (%s)" % (str(e), full_path))
                    continue
                if bpm:
                    continue
                artist = tag.getArtist()
                title = tag.getTitle()
                if artist and title:
                    tempo = get_tempo(artist, title)
                    if tempo:
                        print("%s - %s BPM = %d" % (artist, title, tempo))
                        tag.setBPM(tempo)
                        tag.update()


if __name__ == '__main__':
    if len(sys.argv) <> 2:
        print "Usage: python %s <directory of music>" % sys.argv[0]
        sys.exit(-1)

    process_music(sys.argv[1])