Universal Music Group is releasing a free version of its Six-String iPhone app in addition to the existing paid app in the latest twist in the major labels' app strategy.

The free app includes the song "Raised On Rock," from the Scorpions, as well as the ability to download Lifehouse's "Nerve Damage" and Neon Trees' "Animal" from within the app. Adding free access to downloaded songs rather than embedding them in the app makes it cheaper to download.

The $5 paid version of the app contains the same three songs as the free version, plus an additional seven embedded tracks, which are listed below.

Bon Jovi's "You Give Love A Bad Name"
Fall Out Boy's "Thnks Fr Th Mmrs"
Orianthi's "According To You"
Peter Frampton's "Show Me The Way"
Tom Petty's "Runnin' Down A Dream"
Foghat's "Mumbo Jumbo"
Jackyl's "Loads Of Fun"

Free downloadable tracks in the paid version include:

2 Cents' "Get What?"
Atomic Tom's "Take Me Out"
BigBang's "Call Me"
Four Year Strong's "Find My Way Back"
Rey Fresco's "Precious Time"
Ruby Tigers' "The Deal"
The Toadies' "Song I Hate"

The free and paid apps can also access 50 additional downloadable songs sold at 99 cents each from such artists as Papa Roach, Lady Gaga, Marilyn Manson, 3 Doors Down and Maroon 5. More will be added in the coming months.

From the release:
Six-String app recreates the experience of playing the guitar like never before via a unique game that combines an accurate strumming and picking game interface with tracks culled from the real studio masters for maximum authenticity and sound quality. Six-String's virtual guitar interface lets players pluck, strum and change chords along with the master recording and, with the true sound of discord, spares no mercy when a wrong string is strum.

Billboard's Mobile Entertainment Live: The Music App Summit is currently accepting nominations for its Music App Awards, taking place Oct. 5 in San Francisco. For more information and details on how to submit an entry, visit mobileentertainmentlivefall.com.