these are a mixture of German Artists, from Pop to Metal, I don't have any R&B or Rap German cause I copied & pasted this so I won't have to keep typing this over and over... but if you do want German Rap and German R&B, let me know... i also have French, Korean, Spanish, and yes, Tatu - Russian girl group, unfortunately I don't have any other Russian groups right now but here's the German...
Juli (Girl German Pop) - Dieses Leben, Tage Wie Dieser
Tic Tac Toe (Girl German Pop/Rock) - Es Tut Mir Lied (I Am Sorry)
Laith Al-Deen (Boy German Pop Artist) - Dein Lied, Ruhe, Alles An Dir, Schatten Und Licht, Keine Wie Du, Traurig, Bilder Von Dir, Worauf Wartest Du, Meilenweit, Leb Den Tag (Radio Mix), Es Tut Mir Lied
NDW - Munchner Freiheit (Boy German Rock Band, I like this one quite a bit) - Ohne Dich Schlaf Ich Heut Nacht Nicht Ein <--- this might be a shorter title, I can't read German like I want to...
Killerpilze (Boy German Rock, if you do like rock, this is a pretty good group) - Un Premier Matin Sans Toi, Richtig ScheiBe
Silbermond (Girl German Rock Band, they are pretty good, too) - Du Und Ich (You & I), Ohne Dich (Only You)
Sportfreunde Stiller (Boy German Rock Band) - Sieben Tage Sieben Nachte (Seven Days, Seven Nights); Eine Liebe, Die Nie Ender
Revolverhead (Boy German Rock) - Mit Dir Chillen, Die Welt Steht Still, Generation Rock
Die Arzte (Boy German Rock) - Lass Die Leute Reden
Echt (Boy German Rock/Pop) - Du Tragst Keine Liebe In Dir
ASP (Boy German Metal Band) - Engel in Schwarz (Angel in Black), Schwarz (w/ Samsas Traum)
Rammstein (Boy German Metal Band, I'm not sure if you like the heavy metal but I'll throw this out to you, they are best known for their song, Du Hast (You Hate) other songs...
Bang Bang (this is fast, metal... kind of like if you were watching one of those movie previews that shows fast preview scenes, one to the next)
Hallelujah (this is not as fast)
Una Dich & Die Flut w/ Wolfsheim (these are their slower songs)
Diverse & Oliver Frank (Pop/Dance) - Sehnsucht Heisst, Iche Liebe
I'm sure you've heard of Falco, he sings the 80's hit songs, Der Kommissar and Rock Me Amadeus... he's pop of course...
Der Kommissar (German & English Versions)
Rock Me Amadeus (German & English Version)
Vienna Calling (German Ver)
Auf Der Flucht
Verdammt Wir Leben Noch
Nur Mit Dir
Nena (80's) - 99 Luftballoons (German Ver), 99 Red Balloons (English Ver)
Peter Schilling (80's, famous for his 'Major Tom' song)
Major Tom (Vollig Losgelost) (Deutsch - German Ver)
Weit Weg (this is one of my fav songs from him, it's got the rock in it)
Ich Vermisse Dich (for some reason, this sounds kind of similiar to 80's artist, John Waite's 'Missing' song... but this is my opinion)
Terra Titanic (Lost to the Sea, this is another fav of mine, this is his slower song)
sorry, I don't have the translation for most of the songs... but hopefully this will help you