Israel Kaʻanoʻi Kamakawiwoʻole, also called Braddah IZ or just simply IZ, was a Native Hawaiian musician and singer. He achieved commercial success and popularity outside of Hawaii with his 1993 studio album, Facing Future. His medley of "Somewhere Over the Rainbow/What a Wonderful World" was released on his albums Ka ʻAnoʻi and Facing Future, and was subsequently featured in various media. The song has had 358 weeks on top of the World Digital Songs chart, making it the longest-leading number-one hit on any of the Billboard song charts. Kamakawiwoʻole is regarded as one of the greatest musicians from Hawaii and is the most successful musician from the state.

The World Digital Song Sales chart is a weekly record chart compiled by Nielsen SoundScan and published by Billboard magazine. Established in 2010—its first issue was dated January 23—as one of 21 genre-specific song charts launched by Billboard that year, it originally ranked the 25 best-selling digital singles in the World Music genre, but was reduced to 15 entries in November 2021, and then 10 entries, effective the issue dated October 28, 2023.