Number 4 seems to be Shamrock Shores. If you do a search on www.google, it looks as though it has been done by several groups. Sorry I can help with who your artist is on that one, though. Oops, sorry, spoke too soon, I think. Looks like this is a different one.
It's nice that you've included the mp3...makes it easier and fun to see what we can find out. Thanks!

kat