Upstream
Make tests fail if conversion fails
Restoring
Adds lens.hs sketch
Adds lens.hs sketch
Adds lens.hs sketch
Adds lens.hs sketch
Add Music.Prelude module (convenient alias for Music.Prelude.Standard)
(typo) Add Music.Prelude module (convenient alias for Music.Prelude.Standard)
Adds lens.hs sketch
Adds lens.hs sketch
Upstream fixes

  modified:   examples/mozart.hs
Add explicit async dependency
Use Behavior for pitch by default
Restore MusicXML export