Thing is that to look for Hawaiian music, people would have to take the time to put in their files information that this or that music file is Hawaiian music.
In other words, even if there was a "nationality" selection field, it would only recognise a minimal fraction of files that actually have info about that.

The other alternative would be some kind of database that LW would access upon searching and that would tell it that this or that file is Hawaiian music.
...
Not so easy.

At the moment, I can only recomend you do the same thing I do: go up to the internet, go to Google and search for Hawaiian music or Hawaiian artists. Find a couple of guys and search for their music in LW.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
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The Golden Age Of Leather"
-Blue Öyster Cult-