Many game productions have original music written for in-game scenarios; some also use actual songs sung by professional singers as theme songs. Music in games is a big thing and it's dearly remembered by fans of the game. Sometimes, the music itself is enough to trigger memories of the gaming experience. Thus, game studios need to spend time creating suitable music to complement their games.

If you are a huge fan of video game music, there are also concerts that you can go to where the orchestra plays music from popular games (check out Video Games Live at http://www.videogameslive.com/index.php?s=home).

Creating music for a game is very similar to composing music for a piece; it should trigger appropriate emotions when it's played. The choice of music needs to match the pace and situations of the game. Using a JRPG game as an example, you should be able to differentiate between in-battle music versus the music that's played when you are in a menu, loading the game, or when you've just won a battle. Very often, music is created on the basis of the needs of the game, and the music composer has to probably come up with a few different versions and let the team and/or management review it before the best piece is selected.

If you do not intend to create original music or sound for your game, you can find many free downloadable sounds and music online these days. When using free online music and sounds, do ensure that you do not violate any digital rights or copyrights when incorporating them in your game.