ค้นหาเพลงทั้งหมดที่ไม่มีเสียงร้องนำ
Find all the songs that do not have a lead vocal.
df_songs = pd.DataFrame(columns=['title', 'songid']); df_vocals = pd.DataFrame(columns=['songid'])
df_songs[~df_songs['songid'].isin(df_vocals[df_vocals['TYPE'] == 'lead']['songid'])]['title']