The Internet Archive WAYBACK MACHINE

This isn't Yamaha FG related but I've used it many times.  The Internet Archive Wayback Machine has explored and saved BILLIONS of web pages.  When you find a link that no longer exists, just go the URL above and enter the web address in the box at the top.  After you click Browse History you'll (hopefully) be taken to a page where it will show a timeline of years with peaks indicating they have a saved copy of the website.  Click on a year that has a peak.  Below that are the months in that year.  A highlighted day is the day they did a backup.  Click on the highlighted day to load the website.