My Dear Frodo is a soundtrack from The Hobbit: An Unexpected Journey.
It is the music playing for the opening of the first film, featuring Old Bilbo introducing the history of Erebor. The opening titles feature a variant theme for the line of Durin (The House of Durin theme) played along with the Ring theme's harmonies to set the tone for the subsequent 6 films. Like "The Lord of the Rings" title cards feature the History of the Ring theme, "The Hobbit" title card is scored with the Shire theme. The piece introduces many new themes for the Hobbit trilogy including the Erebor theme, Thorin's theme, Smaug's theme and The Woodland Realm theme.