OMG u have got 2 b kidding they hAve sung over a billion songs! Just Google it is my advise.
See the related link below for a list.
There are only about 5 songs that they wrote but there are a lot of covers for other songs they did.
$20
Some songs they have sung are: California 37 To be loved Drive by All American Girl...
at least 200 to 300 songs
All of Glee's biggest hits, such as Keep Holding On and Don't Stop Believin'.
we want an answer from you. idiot
They are referred to as 'TV Show Tunes'.
type in google followed by, all songs
More than half of all the songs she has sung
Yes they get permission for all their songs
Yes, all the real cast.