Song of Prevalance

Through trials and battles you have learned the path of music as a means of strength, and have learned the ways to share that strength forth. 

Once per long rest you can use an action to play the Song of Prevalence, by playing your instrument and succeeding a DC16 performance check, you cast Bardic Inspiration with twice the effect and the inspired roll is doubled. However on a failed performance check a slot of Bardic Inspiration is consumed without being casted.