Informal Contest Poem: Crack the Code To Win

Within this rhyme there hides a key I have encrypted, Find it if you can crack the code that must be first decrypted, Look upon a poem called "Caesar's Cipher", which I wrote, And within it you'll find a key to unlock the following nonsensical notes: BMEAIRN AFFXYE ZSEHVNO LRH GHM LFWRNKP SJ YIOSX PWEA ELI AUIXGI BF QBPYFIWX As I hint for you, the final B's plaintext is a little clue, For the final word is spelled wrong with a displaced Q. Find my key and create a vertical vigenere tableau, And along the Roman alphabet, align what lies below. If anyone can crack this encrypted code, Write your answer in the comments section, And if it's right I will write you a poem, a personal ode, Or one on any proclivity of yours that suits your predilection.