Hints on the foreign songs

Hey, since only one person ever attempted to guess any of these, I figured I'd give hints, at least for the foreign songs.

01. German; a beer song.
02. Japanese; from an anime.
03. The group who sang this song is best known for their stuff from the 80's.
04. German; heavy metal.
05. The guy who sang this is a bit on the strange side.
06. This song was released twice by the same group; the first was an instrumental.
07. From a musical.
08. Another line from this song: "I'm going to Wichita, far from this offer of forevermore."
09. Japanese; from a rather famous anime.
10. Amanda did guess this last night, but she never posted; it's "Detroit Rock City" by KISS.
11. Guessed.
12. Guessed.
13. This guy is more known for his standup and acting abilities; this is the only song I know of that he ever sang.
14. From a rather famous musical.
15. Japanese; from an anime inspired by CLAMP, the manga-ka.
16. Russian; two women.
17. Guessed.
18. A song denouncing the use of the atomic bomb, sung by a rather famous duo.
19. You've probably heard this song, just not the full version, from a popular FOX TV show.
20. Not much I can say about this one; another line is "Tanya, Turkish, liked to f*** while wearing leather biker boots."