To determine where the musical frequency of notes is decreasing between the given beat numbers, we need to examine the table and compare the given frequencies between consecutive beats.
Here is the data from the table in list form for clarity:
- Beat \#2: 261.6 Hz
- Beat \#3: 392.0 Hz
- Beat \#4: 392.0 Hz
- Beat \#5: 444.0 Hz
- Beat \#6: 444.0 Hz
- Beat \#7: 392.0 Hz
Now, we will evaluate the frequency changes between each consecutive beat:
1. Between beat \#2 and beat \#3: 261.6 Hz to 392.0 Hz (Increasing)
2. Between beat \#3 and beat \#4: 392.0 Hz to 392.0 Hz (Constant)
3. Between beat \#4 and beat \#5: 392.0 Hz to 444.0 Hz (Increasing)
4. Between beat \#5 and beat \#6: 444.0 Hz to 444.0 Hz (Constant)
5. Between beat \#6 and beat \#7: 444.0 Hz to 392.0 Hz (Decreasing)
From these comparisons, we see that the musical frequency decreases between:
- Beat \#6 and Beat \#7
Therefore, the musical frequency of notes is decreasing between beat numbers [tex]\(\boxed{6}\)[/tex] and [tex]\(\boxed{7}\)[/tex].
