hmm if your simply looking for safe music to can simply use creative commons,public domain,cc0 songs while providing credit to composers, some good sites include,
http://www.jamendo.comhttp://www.ccmixter.orgIf your more inclined to create your own music then midi programs like
http://anvilstudio.com/ are good for creating midis and editting
also creates and shows midi file sheet music.
although if you want a higher quality sound that is more realistic than taking
your midi file and using the amazing
synthfont
http://www.synthfont.com/ synthfont (1.711 is freeware newer is not.)
to convert it into soundfonts sounds
http://soundfonts.homemusician.net/are much higher quality since it uses real recorded instruments
from wav. files.
Synthfont also supports VST plugins
http://www.kvraudio.com/q.php?search=1&q=&f1[]=vst
allowing for more effects onto midi files like reverb and chorus
or vsti instruments. lol I know that it all sounds intimidating yet its kinda fun one you get the hang of it.
If producing for commercial purposes I would be sure to use Ogg. Vorbis format instead of Mp3. because of licensing, unless you want to pay the license fee.
Of course theres also Audacity
http://audacity.sourceforge.net/its does not add to composing midi music but its good for editing music files and splicing them together for finished product.
yet sorry for those who use Linux there are not quite as many options for music composing at least none that I know of.
If your also looking for voice actors then
http://voiceactingalliance.com/board/forum.php is a good forum to visit with friendly voice acting talents, (not exactly melody based yet nice place I'd thought I'd mention.) Of course if you want to voice act yourself another great tool is kerovee vst. its a filter that changes your voice, not just the pitch but the timbre as well if set right can create pretty convincing male or female voices, kinda strange when I use the filter my voice sounds kinda like my sister lol. must be family genetics.
you can use it by placing it in audacity's plugins folder. Audacity supports vst effects just not vsti instruments.
here's kerovee site link.
http://www.g200kg.com/en/software/kerovee.htmlkerovee is also a autotune plugin
don't know if any of this might help you mokonafan, I hope it does your a great friend.
hope you have a great christmas.