Photos are a different issue and that is an archive to be proud of.. there are plenty of provisions in place covering unknown ownership of visual images, plus if your old man took them, you inherit the rights to use photographs on behalf of his estate, and gain for commercial use, or waver that, and donate them in any way to an archive (who still often charge for commercial reproduction and then equally will claim copyright as a collection).   You can share them on flickr, but the vultures will hijack and make use of them for commercial gain.   Different issues though over copyright music, and the rights held by publishers/writers and song rights agencies. Also, some singers are likely to be dead, and there is the emotional point of using someone's voice, which maybe upsetting, cringeworthy - or equally comforting and exciting to those relatives of the performers, bringing someone's voice back.