Bards of the College of Rock shun the more intellectual pursuits of their peers in favor of something a bit more primal. While other bards may deal in poems and stories, these individuals live to put on a show and pull all those listening into the mosh pit.

Master of Performance

When you join the College of Lore at 3rd level, you gain proficiency and expertise in performance.

When you make a saving throw to maintain concentration on a Bard spell or class feature, you may use performance as your modifier.

When you roll a 20 or higher on a performance check, or succeed on a performance-based saving throw, regain a use of Bardic Inspiration. 

The World's a Stage

Also at 3rd level, you learn how to weave lines of spells into your song to form arcane chords. When you begin using a spell or class ability that would require your concentration, you may choose to instead use your concentration on a song that will carry that spell or class feature's effects so long as you continue playing, allowing you to maintain concentration on multiple things at once. If the song's effect directly targets a creature, they must be able to hear your song to come under the spell's effects in addition to whatever requirements that effect has.

You may add one concentration effect to your song per round. If you succeed on a saving throw to maintain concentration, you may add a new concentration effect to your song with a casting time of an action or less as a reaction, independently of the normal per-round limit.

If concentration on your song is lost, you will lose concentration on all of the effects contained within. You may willingly drop concentration on one or multiple effects within your song without losing concentration on the song itself so long as at least one concentration effect remains.

Your song can contain two concentration effects at a time. This increases to three effects when you reach 6th level, and to five effects when you reach 14th level. 

You can unleash the power of rock with this class feature once per short or long rest.

I'll Play You In

At 6th level, you can take a bonus action to expend a use of Bardic Inspiration to send a willing creature within 60 ft who can hear you into a rage, granting the following effects...

• Resistance to slashing, piercing, and bludgeoning damage
• An increase to damage rolls on unarmed and weapon attacks equal to your proficiency modifier

...in addition to effects based on what type of rage you chose. 

This takes your concentration and lasts for up to one minute. If you lose concentration, the spell effect is lost.

Only one rage of each type can be active at one time, and a given creature may only be under the effects of a single rage at once.

If the targeted creature is already under the effects of a Barbarian's rage, they do not gain the baseline rage bonuses, but will gain the special effects for the chosen rage.

List of Rages

• Thunderclap Rage: Grants resistance to Thunder and Lightning damage. The raging creature's first attack in a round will deal a bonus 1d4 lightning damage. Their target, on their turn, must make a charisma saving throw or lose their action and take 1d4 thunder damage.
• Dragonforce Rage: Grants resistance to Fire and Radiant damage. At the end of the raging creature's turn, all creatures within 5 meters take 1d6 fire damage.
• Stalwart Rage: Grants resistance to force and poison damage. Grants advantage on saving throws against being made prone, charmed, blinded, frightened, paralyzed, poisoned, or stunned. Grants advantage on saving throws and ability checks against being grappled. Grants advantage on saving throws against losing concentration. Grants a bonus of 5 temporary hitpoints, which replenish at the start of the player's turn.

Finale

Starting at 14th level, you can use an action and end your song in a dramatic fashion, bringing every arcane musical line to a close in a powerful riff.

Make a performance-based spell attack roll against a chosen creature that can hear you within 30 feet. 

On a successful hit, this deals 1d8 thunder damage, plus 1d8 per concentration effect contained within your song.