1) Alternative mark in music 2) Alternative passage in music 3) Alternatively 4) Alternatively but Italian 5) Alternatively in Italian 6) Alternatively but in Italian 7) Italian words and phrase 8) Italian musical term 9) Musical term in Rome 10) Musical term to an Italian 11) Or else 12) Or else, musically 
An unusual use of ossia is found in Alban Berg`s Violin Concerto where several ossia parts are included for the solo violin. If the soloist chooses to play these, the concertmaster is required to play a different ossia (which takes part of the solo violin line that is lost in favor of the soloist`s ossia). ...
alternatively; rather (in music)
ossia 
(indicating an alternative, usually easier, version of a passage in a musical score) or; or else.