Hands-On Mobile, Inc., the guys behind the recent Iron Man mobile game recently announced that their game, Guitar Hero III Mobile, was a big hit among Verizon owners. To celebrate, they're also coming out with song packs for the game!

How popular is the game? Well, to date, they've got over a million downloads worldwide, with 250,000 songs being played daily across the U.S.

Mobile research firm M:Metrics notes that, though consumer demand for mobile games hasn't reached its peak yet, the popularity of Guitar Hero III for mobile phones could change that. Notes Seamus McAteer, senior analyst at M:Metrics, "Guitar Hero is a recognizable franchise that has already won over consumers with the console version, setting it up for great success on the mobile platform."

Beginning on June 1, Hands-On Mobile will also be coming out with monthly song packs to augment the game's already impressive repertoire of hits. The songs included in the June 1 pack include "Stricken" (original recording), "Talk Dirty to Me" (re-record) and "Rock and Roll All Nite" (re-record).

Cites their recent press release,

Through the song pack downloads, players will be able to access more than 50 songs and 150 unique note charts across all three difficulties (easy, medium and expert) within one year of the game's release.

All in all, a best-selling game and a whole slew of new game tracks sounds like music to the ears of mobile Guitar Hero fans everywhere.