Similarity #2: Drones

Drones are a very big part of Mongolian music. Most of the time, there are two parts to Central Asian, and Mongolian, music; one part provides the constant drone while the other plays/sings the main melody. This main melody is a high pitched one with long notes, and may be played by the traditional flutes (similarity #3) or the traditional string instrument, “morin khuur”.

Throughout the Mongolian Idyll, the piano provides the drone, even though it is not as static as it would be when performed traditionally. Especially, starting from bar 23, the left hand part of the piano changes only slightly in 4 four bars, creating a drone in the background while the flute plays the embellished main melody.
Extract from Mongolian Idyll -b.23-26


Stravinsky’s use of drones is more than the use of pedal notes in a symphony. While the reason he uses the drones is similar to Mongolian music, to provide a steady layer under the main melody, how Stravinsky has structured them is quite different.

Extract from Rite of Spring - Rehearsal 28 - b5-10
 In this extract from rehearsal 28 of the Augurs of Spring, Stravinsky uses two types of drones: one is provided by the English horns, playing trills, and the other is provided by the trumpets, playing their “cold” motif, which comes up many times throughout the symphony. 

Another type of drone Stravinsky uses is the French horns playing the same few arpeggios or broken down chords (mostly in fifths or fourths) as the “melody” progresses “above” them .For example,  in The Augurs of Spring-Dances of the Young Girls, the horns play the following motif which they carry out all throughout the movement:
Extract from Rite of Spring - Rehearsal 13-14

Even though the instruments which play this drone-like motif change throughout the movement, the motif itself remains the same, no matter what else the other instruments may be playing. For example, in rehearsal 28 of the Rite of Spring, when the flutes are playing their theme, this drone can be heard in the trombones, along with the “cold” drone of the trumpets and the trills of the bassoons:
Extract from Rite of Spring - Rehearsal 29
Where Stravinsky’s drones part from the drones in Mongolian Idyll is that Stravinsky’s are more dynamic: they move, yet they still maintain the drone quality. 

However, not all of Stravinsky’s drones are dynamic: his frequent use of pedal notes using the timpani or the strings also is similar to the technique of overtone singing used in Mongolian music and can also be seen in the Mongolian Idyll. For example, in the beginning of Spring Rounds of Rite of Spring, the strings play minor chords, using down bow, and the cellos play the fifth Eb and Bb on the first beat of each bar and then the note Gb for the next three beats:
Extract from Rite of Spring - Rehearsal 48
And in the Mongolian Idyll, the right and left hand of the piano play C and Eb almost insistently, while the melody above and the other notes change, also creating a drone effect:
Extract from Mongolian Idyll - b.28-31