When a troop leader with the Boy Scouts we always sang our songs by memory. No chance to hold a song book when hiking or aaround the camp fire.

Now I'm glad that we had learned about 300 songs by heart; the most I still can remember after half a century. Now that I have lost the most of my voice I often hum or whistle the songs and think the words (I call it inward singing).

Sometimes I forget some verses of certain songs, even shorter ones, e.g. John Kanaka. So I have to look it up often. That is exactly what I shall do now. Thanks DT).