Easy:
1. This one is made by a band with rivalry against Metallica.
2. This is made by a german band.
3. A song made by one of the big four in Thrash. (Metallica, Megadeth, Slayer, or Anthrax)
4. If you don't know this one...
5. One of the most influential albums made by a band not part of the big four.
Hard:
1. It's from a decently recent album.
2. Another somewhat recent album. It's on a comeback album from one of the german thrash bands.
3. This was made by a band that released a new album last month after a 9-year hiatus.
4. This one is made by a very underrated band. The band's name refers to belief in some way.
5. This band could be considered crossover, and this song is on their most influential album.
It might not help too much, but I'm not sure what other hints I could give