Time signature
6/4 compound time
Jazz waltz
What time signature does Jazz normally use?
4/4
Sometimes 3/4
The time signature of this piece is unusual
What does Jazz waltz use?
Swing quavers
Drum and bass rhythms
Drum kit (keeps a steady beat) and bass respectively:

Which instrument plays the riff rhythm (ostinato/tremalo)?
Piano
What rhythmic device does the improvisation use?
Syncopation
In which part are triplets used? An what is played beneath?
Trumpet
Riff/ostinato beneath