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Diabolical may as well be considered the last good Naglfar album because almost everything they've done after this suffers from tiresome songwriting and bland ideas in attempt to become more mainstream. Diabolical may be nothing more than a Dissection ripoff for most people, but there is still a lot of quality to be found here and some reasons to listen to it more than once.
At first, Diabolical sounds similar to all the well-known Scandinavian melodeath/meloblack bands because of its "poppy" nature, but due to its cloudier production, vocal style, and flow of the songs, there is a lot in common with Dissection here. The lead guitar riffs drive most of the music. There is nothing too complex here, but most songs are memorable because of the catchy riffs. After that, the vocals, drums, and synths aren't as memorable. This isn't to say they are done poorly, but after years of listening to this album, I don't really remember them as much. Again, I think it has to do more with the cloudier production. All the elements do fit together well - especially on a song like 12th Rising, one of the better ones on Diabolical. Most of the songs have a natural flow - they don't stick to some arbitrary formula where there has to be a guitar solo after two verses or some random breakdown in between. Fast songs stay consistently fast and there aren't any big surprises. You might consider this album pretty predictable, but the music is entertaining enough so that it's a non-issue.
One thing I do like most about this Naglfar album is that the vocals are much better here. The rough production sort of forces the vocalist to sing (or growl?) with more heart and as a result, the music appears more genuine. As far as Jens vocals go, they are your typical higher pitched, screaming shrieks. Nothing too original, but it certainly isn't hurting the music.
Diabolical is a good album to check out if you were a big fan of the popular Dissection albums. The guitarwork may not be as slick and the song writing might not be as varied, but it's great choice if you're looking for something catchy and easy to listen to. Naglfar, like Dissection, even used a nice 2 minute piano interlude, so if you like stuff like that, it's more icing on the cake. Diabolical won't have the replay value of other albums from different bands, but it's a worthy listen if you want something entertaining.