Some of mine are:

 

http://www.youtube.com/watch?v=G6scHgACSD0

 

http://www.youtube.com/watch?v=gVewEox6GBg&feature=related

 

http://www.youtube.com/watch?v=321Cf2RZC7M

 

http://www.youtube.com/watch?feature=endscreen&NR=1&v=gmZ7CsVc_Ng

 

http://www.youtube.com/watch?v=XPQMsrIPQqM&feature=related

Gets great at 0:45

 

http://www.youtube.com/watch?v=uYCRW9_1nxo

 

http://www.youtube.com/watch?v=lxyEdt-TakI&feature=related

 

http://www.youtube.com/watch?v=kTfGQPgWWMI&feature=related

http://www.youtube.com/watch?v=sxbROMQTjKg

http://www.youtube.com/watch?v=ycuB0LwoSf0

I forgot about Draken's Rap! I love that!

 

http://www.youtube.com/watch?v=kb2fdHbGo7k

 

http://www.youtube.com/watch?v=-JmiDRiIHKI&feature=related

There's far too many Phineas and Ferb songs for me to list.

 

But I do like this one from Fairly Oddparents:

I forgot about Draken's Rap! I love that!

 

http-~~-//www.youtube.com/watch?v=kb2fdHbGo7k

 

http-~~-//www.youtube.com/watch?v=-JmiDRiIHKI&feature=related

 

I know! Dr. Drakken is waaaaaaay better than Soulja Boy.

How many of you remember this:

http://www.youtube.com/watch?v=FNl-hgwHAmo&feature=related

 

http://www.youtube.com/watch?v=TeYyzoONK6U&feature=related

 

http://www.youtube.com/watch?v=2NDPT0Ph5rA

 

http://www.youtube.com/watch?v=8P8chaWkmrY

 

http://www.youtube.com/watch?v=wWeP3u5hY8w