"Normaal" is a rock band from the Netherlands, more specifically from the Achterhoek, which is what they base their image on, singing in local dialect. This plus their rowdy style has actually helped them gain national fame. They're the band with the most Dutch top 40 hits without ever getting a number 1 hit. The band started in 1975 as a reaction to disco and gliterrock.
They have a very loyal following of 'Achterhoekers' who follow their tours. The concerts are usually given in tents and are more focused on booze, dames and partying (which they call 'høken') than sound quality. On stage they wear clogs. The music could be typified as 'heavy country rock' (although it couldn't be further from US 'country' music), and possibly as a rowdy version of ZZ Top.
Their first and biggest hit was Oerend hard ('bloody fast'), about two motor riders who "never heard of slow driving". Predictably, the song ends with them crashing, after which they never drive fast again. The band should know what they are singing about because several members have survived serious motor accidents.
*http://www.normaal.nl/ http://www.normaal.nl/, the official website, in Dutch