The underlying problem as I see it is, that the person who assigned the attributes to the "Izzy" example,
didn't bother to, or had no way to, take into account and enter an attribute for, a uke sound.
The song title descriptions for "Somewhere over the Rainbow" seem accurate (see attachment). Although I am wondering if it is actually a swing tune - it's a bit in between.
The style filters are set based on feel, tempo, genre of the song, and perhaps it could place more emphasis on keywords - e.g. "ukulele" as you suggest. There are almost certainly some options we could add to improve the feature using the existing information in the database that has manually been created by people listening to the tunes.
What are the top styles that YOU would have chosen, had you chosen the best one for the IZ version of Somewhere...? It would probably be best just to start with a blank style and look for a Ukulele RT that might work. I mean, the best one is probably FolkSwing 140... would you say?