# Pastebin dP1T3t9U
# Listing unknown rec-MBIDs with timestamp

unk_rec_mbid = in_for_rec_redir[-out_for_rec_redir]

unk_rec_mbid_timestamp = df[['timestamp', 'recording-MBID']][df[['timestamp', 'recording-MBID']]['recording-MBID'].isin(unk_rec_mbid)]
unk_rec_mbid_timestamp.to_csv('unk_ids/unk_rec_mbids_timestamp.txt', index=False)

unk_rec_mbid_timestamp.head()