Chorus

Caster creates a musical accompaniment that follows the music provided by the caster (Instrumental or singing).  For example: a Bard casts  Chorus  and then plays her instrument will have the spell  fill in the missing pieces of music. Caster takes a DC10 check based on the casting ability used to create the spell.  Bards would be Charisma. Etc. etc.  A failed check resist in the music being off-key, badly synchronized or other negative effect as determined by the DM. A critical failure results in a greater penalty to the caster, ranging from loss of reputation, loss of funds, being driven out of town or any other measure deemed suitable by the DM.  A successful check between +1 to +5 gives the caster increased reputation. +6 to +10 includes the benefit of level 1 success plus increased revenue from the showing (Passing the hat, etc.) +11 or higher includes the previous 2 levels of success plus a minor boon such as a patron.  A critical success grants a major boon as determined by the DM.  A critical success should treat the music as angelic in nature.