Time Signature: The time signature is a symbol placed at the beginning of a piece that indicates the meter by specifying the number of beats per measure and which note value gets one beat.
Duple Meter: Duple meter has two beats per measure, with emphasis on the first beat. It creates a strong and steady feeling.
Triple Meter: Triple meter has three beats per measure, with emphasis on the first beat. It creates a waltz-like or dance-like feeling.