Vigenere cipher - cat song / word search

Lyrics of my favorite cat song, Vigenere encrypted. Decrypt.

Alternate puzzle: Find the longest word hidden in the letter grid below. As in other word searches, words can be read horizontally, vertically, & diagonally, both forward or backward.

CINQKGQOTCFSHQDYO SAIJEVSFNKWYOGAXKNHFSKI BJRSNEKEBORLJWOM YJZPVQGCZSNCOZXZPOFAKNVLATFKM FXDASMISEZFIXNERUOYRKTBHJ XKNHRDOIMCALHUMK KEPNYSCQLJSOBTRYORP RCSIOJZVSLGVHSQSIHYTDGOETMYDF AGLOIEOAFHZAJC AATXVZJEUZZSHTRVVCXN JCXMBJDNXQAIDLFPZ LWMCIDTPMFAPBMKMCBSNXAIYNGSXZ JZQIDBKDCWBNHJZIVPAMOENSCP QOGIKARFZCSFNJMXRQYSVLY ZTXUHHFLOERHPJPXKNHRKYSVLY LWMCIDTPMFAPBMKMCBSNXAIYNGSXZ

Have you done something sneaky like restart the keyword on each line?

Has anyone got any pointers on source code for the Chi-square algorithm?

Cam

Or, to put it another way:

YVSPMJGDA ZWTQNKHEB XUROLIFC

It's often helpful to identify key regularities...

Thanks for the tip Jim. But why would you write it like that - granted it makes it very easy to see the pattern, but it is no longer in a form that can be plugged straight into a decrypter to verify. Would I have been better writing it something like the following? Lx, Lx-3, ..., where initial value of Lx is 'R'

Cam

Simply because it makes it easy to see the pattern, at which point you do the 'Lx-3' decimation you describe below and declare success. If you already see the pattern, no need to line up the recovered alphabet.