Oboe D'amore

The oboe d'amore (oboe of love), less commonly hautbois d'amour, is a double reed woodwind musical instrument in the oboe family. Slightly larger than the oboe, it has a less assertive and more tranquil and serene tone, and is considered the mezzo-soprano of the oboe family, between the oboe itself (soprano) and the cor anglais, or English horn (alto). It is a transposing instrument, sounding a minor third lower than it is notated, i.e. in A. The bell is pear-shaped and the instrument uses a bocal, similar to the larger cor anglais, whose bocal is larger.

Read more about Oboe D'amore:  Invention and Use, Modern Instruments