It fully depends on the harmonic framework: If you have a framework of Am, Dm, G, C, a F# is not appropriate (and this scheme is most used by the Stones, I don't know of on song with Am/D). If you have a framework of say Am, Dmaj, Emaj a F# is fully appropriate. By the way, there's also a difference between descending and ascending scales. To have a dramatic effect, you could choose to
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