Focalink 12 Hole Sweet Potato Ocarina in Alto C Blue by Focalink. $67.00. The 12 hole Sweet Potato Ocarina, key of A4-F6, is tuned in the key of C, and can go below C down to the A. This ocarina has exquisite breath response and crystal clear tone. This ocarina was produced for Songbird Ocarinas by Zack Shih of Focalink, based in Taiwan. His instruments are of exceptional quality and sound. Presented and supported by the legendary Songbird customer service team.