Simple RAW thread for 3.5 #31. By now, your question has probably been answered.

[Xethik]

A 042

Snowsong is an Area spell, and follows the general rules for such spells. An Area spell can move with the caster, but that needs to be explicitly stated. For example:
The Snowsong description contains no statement about it moving with the spellcaster. Consequently, Snowsong is centered on a grid intersection that was part of the spellcaster's square(s) at the time of casting, but does not move thereafter.

Good to know I wasn't just missing something. I've seen the spell recommended in several places for Persistent Spell metamagic. Doesn't seem to make much sense doing that with a fixed area like this.
Thanks