Composer Mark Morgan contacted us to inform us his "Vault Archives" remastering project for the Fallout songs he composed is now done, and they are available for free over on Aural Network. There's four titles that can be streamed, and the whole album of 24 tracks is available for download and non-commercial use.
Link: NMA mirror.
EDIT: it looks like the download link has been (temporarily?) disabled on Aural Network. Use the NMA mirror to grab the full album.