On the left is the oboe.
Next is the oboe d'amore. It sounds a third lower than the oboe and is used mainly in older music like Bach and Telemann, although it was used in Ravel's "Bolero" (the theme from the Bo Derek movie "10").
On the right is the English horn or if you prefer, the cor Anglais. This is even lower in sound than the oboe and the d'amore and used frequently.
I regularly play the oboe and English horn, althought this weekend is a Bach Cantata in which I will be playing the d'amore.
Just thought you might like a peek....