Final answer:
The sales volume of Songsus last year refers to the total number of songs sold by the company during that period.
Step-by-step explanation:
The sales volume of Songsus last year refers to the total number of songs sold by the company during that period. This information is important for tracking the company's performance and understanding its market share. To determine the sales volume of Songsus last year, you would need to gather data on the number of songs sold by the company and calculate the total.