What's the use of a national K-song in hot summer?

"Cool Summer" is an activity launched by the national karaoke App. Participants can complete tasks according to the requirements of the activity, and get certain rewards during the activity, including sound props, gold coins and members. Get corresponding rewards, sound props can be used for personal data dressing and singing effects, gold coins can be used to buy songs or give gifts, and members can enjoy more rights and services.