Hey, thanks for quoting my comment! :D

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Here is some more fantasy inspired metal:

Blind Guardian's (Power Metal) latest album has a songs about The Witcher and American Gods.

Bloodbound (Power Metal) has songs about A Song of Ice and Fire and Lord of the Rings.

Cain's Offering (Power Metal) has a song about The Sandman (Morpheus in a Masquerade).

Crystal Eyes (Power Metal) has a song about Forgotten Realms (Forgotten Realms).

Eternity's End (Power Metal) has a song about The Dark Tower (The Dark Tower).

Sabaton (Power Metal) mostly sings about history but they have a song about Lord of the Rings as well (Shadows).

Wind Rose (Power Metal) has a song about Lord of the Rings (The Breed of Durin, probably others as well).

Summoning (Atmospheric Black Metal) reportedly has plenty of songs about LOTR (I only know one song so I can't confirm that, but that's what I've heard).

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There are also dozens of metal bands that create their own fantasy stories* and then write songs about them. Some examples of these are Dragonland, Fairyland, Rhapsody, Twilight Force, and Marius Danielsen.

*These stories aren't usually released as books however, only as songs.