With this plugin you can add songs/music files in a .ini file and one of those sounds will play in the end of each round. It supports both .mp3 and .wav files. I decided to post this because the only approved plugin I could find here is this one, and it's obviously poorly coded and redundant.
☄ Configuration
You need to add the songs in configs/REMusic.ini - each song on each line. Example: if the song is located in cstrike/sound/iplay/pesna.mp3, you need to add only iplay/pesna.mp3.
☄ Settings
remusic_random "1" -- Whether the sounds will be chosen randomly or they will be played 1 by 1 as set in the file.
☄ Commands
say /ers -- With this command every player can mute the sounds if he doesn't want to hear them.
Threaded Mode