It depends on the song, but over-all Lisa does the most in their songs.
Lisa does the more consistent and lower parts, wile Jess does the high and powerful parts. For example, in their song "4ever" Lisa starts out the song and Jess joins in in the chorus. In the chorus for that song, you mostly only hear Jess unless you pay attention, at which point you can hear Lisa harmonizing.
Lisa and Jess rarely sing the same exact thing at the same time, so it's hard to say exactly who sings more. To do that you'd have to time up ow many seconds each sings in eachof their songs... Good luck with that ^^
They have sang many songs. An exact number is not known, as there are songs they sang before becoming famous, and songs that were demos for their records that have not been leaked.
To give you a rough idea, I have on my iPod 128 songs sung by the veronicas (some are just different versions of the same song though), a cover by Lisa, 2 songs by other bands featuring Jess, 2 songs by another band featuring both girls, 5 songs from Lisa's side project, the one song from Jess's side project.
And there's still many I don't have
A lot of songs... But they're most famous probably for their songs Untouched, Hook Me Up and 4ever
Ellis loves Emily and Haley 4everv
How many songs has Justin bieber sang
24
They have sang about 127 cameos forother bands
1
As of 2013, Pitbull has sang 123 songs.
The band lawson have sang 5 songs
The Veronicas did because they sang it first but thought that they should give the song to someone else because they thought the song didn't suit them, so they gave it to Everlife.
she sang 40 songs
a lot of songs
Ellis loves Emily and Haley 4everv
How many songs has Justin bieber sang
1
24
He sang way too many to be counted!
There are many songs called Why, but I know the Avril Lavigne sang one...
she sang 40 songs exactly