There are many different types of concertinas , which is why Boeremusiek has so many sounds and styles , and the construction the concertina is what makes the different sounds in the Boeremusiek band ; it depends on where the slots and holes are put makes the difference on the sound that the concertina makes . There are many different types of concertinas , which is why Boeremusiek has so many unique sounds and styles , and the construction the concertina is what makes the different sounds in the Boeremusiek band ; it depends on where the slots and holes are put makes the difference on the sound that the concertina makes .