•You can unlock one of them by completing a Career mode.
•Another is unlocked by completing two different Career modes.
•The last is unlocked by completing three different Career modes.
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You beat all of the songs in that venue (getting 3 stars at minimum...) Once you beat all of the venues and career modes,(lead guitar, bass guitar, guitar duel) you get the last 3 bonus songs.
I don't think you can.
There is no cheat. You just have to beat all of the songs.
To unlock songs on guitar hero, you have to beat the first songs, the songs not done yet, to unlock the next set of songs, and you keep going until you've unlocked and beaten every song, just remember the songs get harder as you go down and finish more and more no matter what difficulty you're on. say you're on easy mode and you have beaten every song you go to the next difficulty which is medium, and then keep going.
No, I have used the cheat to unlock all quickplay songs and it is not there.