Hollowfox.. You just described my own experience exactlyI was singing at my club the other day and someone said to me they liked the song but why did I sing it in that strange voice when I was usually sang much deeper and less quavery. I then realised I was singing the song as I had heard Peter Bellamy record it. Thats when I break out in a cold sweat.
At the risk of starting a new thread I hope that making a song your own doesn't include this strange new habit singers have of slowing songs way down and adding lots of note elisions and embellishments. I heard someone performing "The weaver and the factory maid" ( a song written to match the pace of a steam driven loom). I was asleep by the end of verse 2. Have your own version by all means but keep the songs context in mind