Why should Wal-Mart provide the medium by which a singer can spread
derogatory comments about Wal-Mart?

For profit. The CD's sell for more than WalMart pays for them.

I can see you're not a Sheryl Crowe fan.
(The reference to WalMart was extremely benign.)

If someone wanted to hold up a sign
saying "Gould is...(gay, a pedophile, etc)", would you offer them your front
lawn to carry it around on?

Not the same thing. You're comparing a
single mention of a business name in a recording to a group of organized
pickets making disparaging remarks.