นักดนตรีนามสกุล "Heilo" เล่นเสียงประเภทใดในเพลงชื่อ "Der Kapitan"
Which vocal type did the musician with last name "Heilo" played in the song with title "Der Kapitan"?
df_band = pd.DataFrame(columns=['id', 'lastname']); df_vocals = pd.DataFrame(columns=['songid', 'bandmate']); df_songs = pd.DataFrame(columns=['songid', 'title'])
df_vocals[(df_vocals['bandmate'].isin(df_band[df_band['lastname'] == 'Heilo']['id'])) & (df_vocals['songid'].isin(df_songs[df_songs['title'] == 'Der Kapitan']['songid']))]['TYPE']