Revamped Music Meme

Okay, so I put together a five minute clip of twenty songs I love. You are required to try to figure out what these songs are - title and singer. If you don't know the title, at least take a stab at the singer or the anime it's from (if it's from one). If it's too tricky, well, at least you can listen to a random assortment of stuff I like and be all "who the heck is this person?" XD

Song Count: 20 (...right?)

Hints:
- There are four different languages represented. I should have added "Endless Love" and "My Heart Goes Boom", "Bachiamo", and something by Selena to make eight. Oh well...
- All of my favorite seiyuu are represented except for Saki Nakajima.
- I think only one artist is represented twice.
- Only two anime songs are from anime I have not seen any episodes of.
- Some songs include the title in the song.
- One song should definitely have a familiar beat, but someone else sings it. XD

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