Available buffs:
The Moxious Madrigal - 2mp, increases your moxie by 10 points
The Magical Mojomuscular Melody - 3mp, increases your MP by 30 points
Cletus's Canticle of Celerity - 4mp, increases combat reaction times... I think this means that you are more likely to doge, and less likely to be taken by surprise.
The Power Ballad of the Arrowsmith - 5mp, increases you muscle by 10 points
Polka of Plenty - 7mp, increases the amount of meat dropped by monsters
Brawnee's Anthem of Absorption - 9mp, monsters do less damage to you
Fat Leon's Phat Loot Lyric - 12mp, increases the number of items monsters drop
The Psalm of Pointiness - 16mp, damages monsters when they hit you
Stevedave's Shanty of Superiority - 30mp, increases all of your stats by 10%
Jackasses' Symphony of Destruction - 20mp, increases melee damage (critical hit?)
Aloysius' Antiphon of Aptitude - 40mp, gain more stats from fighting monsters
The Ode to Booze - 50mp, increases adventure gains from drinks

You can only have 3 of these songs cast on you at one time. One cast is 15 turns.

Available Buffs:
Elemental Saucesphere - 10mp, Provides some defence against fire, cold, stench, and spooky dammage. Also lets you adventure on the icy peak without cold weather gear.
Jalapeño Saucesphere - 5mp, Damages monsters when they attack you, and returns the damage as Hp
Jabañero Saucesphere - 10mp, Damages monsters and returns the damage as Mp.

One cast is 10 turns.

Available Buffs:
Ghostly Shell - 6mp, Reduces damage taken during combat
Tenacity Of The Snapper - 8mp, increases the damage you hit for during combat
Empathy Of The Newt - 15mp, Increases you familiars weight by 5 pounds
Reptilian Fortitude - 10mp, Increases your HP

One cast is 10 turns.