Here are my top five favorite Undertale Boss songs

5.

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Finale - Omega Flowey Final Stage

4.

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Save The World - Asriel (Chara: Azzy) Dreemurr. (Serial Murderer.) Stage Three, the true finale.

3.

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Megalovania - Sans's boss fight. A true Hell
Sans: He had a bad time.

2.

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Death By Glamour - Mettaton EX
Mettaton: OH YES

1.

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Battle Against a True Hero - Undyne The Undying (Undyne Determination/Heroine form)