1) Tones of low frequency or range.
2) The lowest sounding instrument in an instrument family.
3) Lowest Male singing voice.
4) The Double Bass.
5) Bass Guitar.
Pitch
The location of a note in accordance to its lowness or highness. The perceived frequency of sound.
Rhythm
The combination of sounds and silences, both short and long, in music.
Countermelody
A sequence of notes (melody) that is played against a more prominent, lead melody. Typically a countermelody performs a less significant role and is heard in as a texture.