What's the deal with Ashley and Mona's theme songs in universe?

[CM30]

Namely, why do completely unrelated characters sing versions of these songs before Mona's stage in WarioWare Touched?



See about 1:25 onwards in the video for examples...

Did the characters sell their theme tunes in record form or something? Seems a bit odd given that Mona is a competing artist and Ashley a character who's likely got no real interest in financial gain...

 

[ShyGuyXXL]

Don't forget Mike's theme song, sung by Sal Out (same person who sung Mona Pizza's theme).

Her, apparently.

Well, she sung the Mona Pizza theme way before Mona became an artist herself so....yeah.


And this Luna person...? No idea. :u

 

[JoeKarta]

Maybe its like the real world were some singers sing older songs and it counts as a new song.