Old Noldorin
partha-
verb. to arrange, compose
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A verb in The Etymologies of the 1930s attested only in its (Old Noldorin) infinitive form ON. parthóbi “arrange, compose”, derived from the root ᴹ√PAR of similar meaning (Ety/PAR).
Neo-Sindarin: I would adapt this verb is ᴺS. partha- “to arrange, compose”, the obvious Sindarin equivalent of the Old Noldorin form.