Tun"a*ble*ness

from The Collaborative International Dictionary of English v.0.48

Tunable \Tun"a*ble\, a.
   Capable of being tuned, or made harmonious; hence,
   harmonious; musical; tuneful. -- {Tun"a*ble*ness}, n. --
   {Tun"a*bly}, adv.
   [1913 Webster]

         And tunable as sylvan pipe or song.      --Milton.
   [1913 Webster]