Slowing the song down is a problem.
I'll use The Sound of Music
as an example. The Lonely Goatherd
, is an upbeat fast song, but it's also used as the song for dancing the Lšndler
. It's slowed down an slightly rearranged, but the same song. If someone with a weaker voice than Julie Andrews or Mary Martin had to have The Lonely Goatherd slowed down to accommodate their range, the Lšndler
would have also needed to be slowed down to distinguish it from The Lonely Goatherd
The same would apply with On My Own
, otherwise if it's slowed down it'll be a reprise of Fantine's Death (Come To Me)