Welcome. You may find that some links to videos are dead. That's because the music publishers and the posters play "copyright cat and mouse". The publishers find a video and send a "take down" notice under the DMCA. The hosting service takes down the video, but eventually it pops up somewhere else, often overseas, where the DMCA is often ignored.
I delete old posts with dead links when I get a chance, but it's not a priority. Sorry about that .... Lee
