Hedgewars already has some good-quality music, but a few more tracks can't hurt, because a couple of tracks are reused.
What Hedgewars is needing badly currently are new music tracks for the sudden death. At least there should by one at minimum, ideally, there are multiple ones, tailored towards a theme. Officially, almost all themes do not play a track in sudden death, and the one theme which does simply reuses a track from another theme.
The developer team also is looking for a jungle-themed track, although this is not as important.
Hedgewars is always looking for voicepacks, this is where voice-acting comes into play. A voicepack is a set of audible taunts which are usually played after a turn has been made.
Some useful links here:
http://www.hedgewars.org/node/5952Although the barrier for voicepacks being accepted into Hedgewars is a bit high in my experience. Otherwise, it can simply be provided as an unofficial community add-on, because Hedgewars has a simple add-on system.
If you are intestested in contributing something for Hedgewars, feel free to take a look at the Hedgewars forums:
http://www.hedgewars.org/forumI also strongly suggest to directly talk to the developers in IRC first, they can tell you more. The developers appeciate contributions. The URL to the chatroom (requires IRC client):
irc://irc.freenode.net/hedgewarsIf you do not have an IRC client, you can also use webchat which works in your browser:
http://www.hedgewars.org/chatI used a lot of Hedgewars-specific terms here. You will understand them as soon as you played Hedgewars a couple of times. If you want to contribute stuff to Hedgewars, you should play it first a couple of times, also to get a “feeling” for what atmosphere is desired here.