Collage of the Phantom Music

The Bard can create an entire orchestra by themself with whatever instrument the Bard chooses. The sound comes from all directions, and the only way to stop the sound is to kill the person playing the song or outperform them. 

Bonus Proficiencies

You gain proficiency with 2 instruments when you choose this subclass. 

Phantom Orchestra

At the third level, the character gains the ability to summon ethereal instruments being played by ghosts (Maximum of 5) to aid in helping their party mates, however, you cannot attack with non-spell attacks using this feature. As a bonus action, you can summon up to 5 ghosts to help aid the party with fighting, you can do this up to their Charisma modifier after every long rest. This summons a 30 foot radius area of effect buff. You choose as many creatures as you want (Up to your proficiency bonus) to gain a Plus 1d4 to any skill checks, saving throws, and attacks. They also gain 1d4 bonus to Armor Class when concentrating on the song for more than 5 rounds. However,  after the fifth round,, you must make performance checks each round (past the 10th round, you roll performance at disadvantage, and after the 15th round, your concentration drops).As long as your song is being played, the creatures you chose keep the bonuses to attacks, skill checks, and saving throws. After being hit, however, you must make a concentration saving throw or everyone buffed by the song no longer has the bonuses.

This die also increases at certain levels, the die increases to a d6 at the 5th level, a d8 at the 10th level, and a d10 at the 15th level. However, the Armor class die stays the same no matter what level. 

Phantom Paralysis

Within a 20 foot cube from the person playing the music, all projectiles drop, and all creatures within the cube are affected by the plant growth spell, meaning 1 foot of movement takes 4 extra feet of movement, and anyone inside attacking has disadvantage on all attacks because of being slowed. 

Phantom Presence

When performing with your band of ghostly figures, you gain the ability to phase in and out of existence as you temporarily become a phantom. This gives you half cover while performing with your Phantom troupe. (If you already have half cover, this is obscelete. 

Additionally, while performing, you can phase through solid objects, and when hit, you half the damage taken against every damage other than force and psychic, and advantage on saving throws that deal physical damage (aka fireball and spells like that) and concentration saving throws dealing with keeping up the song.