what are some western sounding riffs, like the intro to Battery by Metallica?
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Depends on the chords being played behind the licks

Listen to some country songs most all are major chords.
if you mean like cowboys and indians western...

try a band called The Shadows

more specifically a song of their called Apache.
Bring It On Home and Bron Yr Stomp by Led Zeppelin and the solo to Holy Wars by Megadeth are westren sounding
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