とりあえず書いてみました。
こんな感じで取得できそうです。
Python
1from mutagen.mp3 import MP3
2
3mp3 = MP3('sample.mp3')
4info = mp3.info
5print("LENGTH : {}".format(info.length))
6print("CHANNELS : {}".format(info.channels))
7print("BITRATE : {}".format(info.bitrate))
8print("SAMPLE RATE : {}".format(info.sample_rate))
9
10tags = mp3.tags
11print("TITLE : {}".format(tags.get('TIT2', 'No title')))
12print("ALBUM : {}".format(tags.get('TALB', 'No album title')))
13print("ARTIST : {}".format(tags.get('TPE1', 'No artist name')))
14print("TRACK : {}".format(tags.get('TRAK', 'No track number')))
15
16artworks = tags.getall('APIC')
17for artwork in artworks:
18 print("ARTWORK : {}, {}bytes".format(artwork.mime, len(artwork.data)))