I"ve been employing some the techniques discussed here since I started playing in church again. I discovered that the hymns were actually easier to play and more interesting when improvised. The pianist does it so why can't I? We're a non-liturgical church. I just got bored with holding whole notes in the left hand and pedal for measure after measure. I can't beleivethat I didn't even know about improvisation when I took organ lessons in high school but it just sort of came to me without the use of any books.