That used to irk me but u gotta remember that most times live versions of songs take shape over the years as much as the voices of the artists..We may know love the album but when you been singin/rappin/playin for 20 years+ sometimes u gotta remix your best shyt to keep it interesting and make every gig different than the last one...
Mint Condition will jam out any song of theirs into reggae/jazz/funk/rock at the drop of a hat and I love those brothers for that reason...
Elton John doesn't hit those high notes no more like the 70's-80's but the gruffness of his voice adds character to his classics...
Prince stopped doin splits and the jumps off the pianos way back when but u still always got the same energy of a vintage Prince