You are free to use Summer Can Last More music track (even for commercial purposes), but you must include the following in your video description (copy & paste):
Summer Can Last More by Vlad Gluschenko | https://soundcloud.com/vgl9
Music promoted by https://www.free-stock-music.com
Creative Commons Attribution 3.0 Unported License
https://creativecommons.org/licenses/by/3.0/deed.en_US
Summer Can Last More by Vlad Gluschenko | https://soundcloud.com/vgl9
Music promoted by https://www.free-stock-music.com
Creative Commons Attribution 3.0 Unported License
https://creativecommons.org/licenses/by/3.0/deed.en_US