Glass Ball Slack Key is a favorite chestnut (or perhaps kukui nut) of uke players in Hawai’i; it’s a fun little ditty that is sure to please aunty or uncle.  I learned this song watching and listening to the great Led Ka’apana over the years.  A recorded version can be found on the classic Led Live album.  Many other ukulele players have covered the song over the years as well.  Hope you enjoy.