1. The root note is the lowest note in the chord arranged in thirds. For example, the 1 in 135351513 is the root note.

2. Bass is the lowest pitch among all sounds. For example, 1 in 135 is bass, 3 in 351 is bass, and 5 in 513 is bass.

3. The bottom note means the lowest note in the chord. The 1 in 135 is both the root note and the bass note.

4. For intervals, the root note and the bass note are the same, and they both refer to the lower note.

5. For chords, the bass refers to the lowest note, and the root note refers to the lowest note in the original chord. ?

6. For the same chord, no matter how it is inverted, the root note will not change, but the bass will change back and forth.

Extended information

Music tone system

1. Definition: The sum of sounds with fixed pitches used in music is called the musical tone system.

2. Sound sequence: The sounds in the musical sound system are arranged in ascending or descending order, which is called a sound sequence.

3. Sound level: Each sound in the musical sound system is called a sound level. There are two types of sound levels: basic sound level and modified sound level.

4. In the musical sound system, seven sound levels with independent names are called basic sound levels. The names of the basic pitch levels are marked both by letters and by roll call.

5. Two adjacent notes with the same name are called octaves. The sound obtained by raising or lowering the basic pitch level is called a modified pitch level. ?

Reference materials: Baidu Encyclopedia-Music Theory

Baidu Encyclopedia-Music Theory Knowledge