This was so funny until I remembered the word ex.....Yeah, great songs also make me more hooked to the game itself so it's a must.
I also listened to Rance's final battle song and it became one of my favorite soundtracks. If there are great songs it just makes the game more worthwhile playing.
I cant imagine playing G-senjou without any music or any other of my favorite games.
Voices also make the game more enjoyable. Steins;gate was just fantastic with Okabe's voice.