Electronic music is just emotionless music in every way if it's not mixed with real instruments. And especially the Half-Life music since it's not mixed with anything, you only have those cold computer sounds. While the Half-Life music is definitely better than most music found in games these days it doesn't compare with the epic music found in games like Fallout 3 and Halo 3. Half-Life also lacks a theme song for some reason. Anyways, instrumental music all the way. It has a big emotional impact that electronic music doesn't have.