Have any of you guys tried the Marcello/Vivaldi cello sonatas at pitch? Marcello's 6th sonata lays really well that way and some of the others look like they probably would too, but it's still tricky enough in thumb position to be a fun challenge without sucking up months and months of practice time. Are there any recordings of them played this way? I have yet to unearth any and it'd be cool to see/hear it done on bass.