Now this is interesting. From the US Copyright Office:
Type of Work: Music
Registration Number / Date: PAu003546425 / 2010-10-15
Application Title: Monster.
Title: Monster.
Description: Electronic file (eService)
Copyright Claimant: Bradley Buxer. Address: 553 Summit Oaks Ct., Nashville, TN, 37221, United States.
The Michael Jackson Estate d.b.a. c/o Hoffman, Sabban & Watenmaker, Transfer: By Will. Address: 10880 Wilshire Blvd., Suite 2200, Los Angeles, CA, 90024, United States.
Date of Creation: 2009
Authorship on Application: Bradley Buxer; Domicile: United States; Citizenship: United States. Authorship: music.
Michael Jackson; Domicile: United States; Citizenship: United States. Authorship: music.
Rights and Permissions: Bradley Buxer, Songwriters Guild of America, 209 10th Avenue South, Suite 321, Nashville, TN, 37203, United States, (615) 742-9945,
sfein@songwritersguild.com
Copyright Note: C.O. correspondence.
Names: Buxer, Bradley
Jackson, Michael
Michael Jackson Estate
Brad Buxer had nothing to do with the Cascio Monster and neither Cascio nor Porte are credited here. Which means it's more than likely a different song. So Michael just happened to have two songs called Monster? Hmmmm.