Katayoku no Taka

Katayoku no Taka (One-Winged Hawk) is the name of a character song for Shanks. The musical score appears throughout the early episodes of the series, up to the Loguetown arc. The lyrics are essentially sung in opera-style, with classical instruments such as the piano and violin being used for the musical score. (http://onepiece.wikia.com/wiki/Katayoku_no_Taka)