- During WWII, the US government distributed plastic ocarinas to soldiers for entertainment, chosen for their portability, durability, simplicity, and low cost.
- The ocarina, a vessel flute, was easier to play than transverse flutes and tuned to C major, matching popular sheet music. It had cultural recognition from films and music.
- Two models were issued: the Gretsch "sweet potato" ocarina and the tunable Tonette, both with fillable holes to simplify learning and extend range as players advanced.
- Accompanying method books provided instruction from basics to ensemble playing, supporting the Army's goal of accessible music for troops.
- Post-war, many ocarinas were kept as souvenirs. While Gretsch models are now collectibles, vintage Tonettes often outperform later versions in sound quality.