Musically, the paean was a choral ode, and originally had an antiphonal character, in which a leader sang in a monodic style, with the chorus responding with a simple, informal phrase; however, later in its development, the paean was an entirely choral form. Typically the paean was in the Dorian mode (note that the Ancient Greek Dorian was different from the modern Dorian mode; see musical mode), and was accompanied by the kithara, which was Apollo's instrument. Paeans meant to be sung on the battlefield were accompanied by aulos and kithara.