MySQL - Selecting data from multiple tables all with same structure but different data

id, band_name, song_name, album_name, genre

SELECT * from us_music, de_music where `genre` = 'punk'

#1052 - Column 'genre' in where clause is ambiguous

(SELECT * from us_music where `genre` = 'punk')
UNION
(SELECT * from de_music where `genre` = 'punk')

SELECT * from us_music, de_music where `us_music.genre` = 'punk' AND `de_music.genre` = 'punk'