A PM, eh wot?
....oh! Well damn, I'm late on that. *Types away*
In the meantime, lack of combat use is good, in that case lemme see which spells would be fitting for your selection. Performance boosters and ranks are assumed.
Call Lightning: For heavy metal performances, make sure you aim it somewhere where it won't hurt anyone. Sets up a dramatic BOOM!
Color Spray: Aim it in the air for a lightshow. Try not to stun your listeners.
Contingency: When you want an effect to go off without using actions.
Dancing Lights: Well this one just obvious.
Darkness/Daylight and similar: Adjust the lighting conditions to help your color displays pop out.
Delayed Blast Fireball/Fireball/Fire Seeds/Fire Trap: I mean delayed blast fireworks. Also works with similar spells.
Enthrall, Hypnotic Pattern, and similar: Fascinate them like a bard. Well, you might be a bard.
Entropic Shield: Noted for this part, "A magical field appears around you, glowing with a chaotic blast of multicolored hues." Sounds rave-tastic.
Faerie Fire: More rave party antics.
Flare: More flashy bangy stuff.
Nonharmful "Cloud" spells: Have it pour over the ground like fog machines or cold smoke.
Ghost Sound: For making music.
Minor/Major Image and the like: Illusions are your bread and butter here, providing both audio and video aspects. Honestly, this line can do the whole thing solo.
Glitterdust: More magical sparkle effects.
Halluucinatory Terrain/Mirage Arcana: Maybe you need to adjust the environment to fit the music.
Illusory Wall: Use it to hide your smoke machines and equipment.
Prismatic Anything: Same thing as Dancing Lights, just don't have anyone get hit.
Prestidigitation: Use it for minor SFX work.
Sculpt Sound: Here we go, this is what we really want. As far as audio goes, this is king.
Sunbeam/Sunburst: LASERS make everything better!
Ventriloquism: Part of your sound-editting software to use.
Looks like your best bet, magicaly, is using the illusion line (multiple persistent images seem best), and edit other sounds with sculpt sound and ventriloquism. Then apply lasers as appropriate.
You can also summon musically talented creatures (such as those fey, what are they, Grigs?), or friendly noise making Destrachans.
To make it more like a DJ, you could have aforementioned persistant image spells be contained on reuseable discs. When activated, they begin playing their pre-determined track until its done or its canceled.
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And some mundane or item based options for you...
Actual Fog Machines: Something sufficiently cold can get you some dry ice and subsequently fog effects.
Continual Flame Iuon Stones: Get hundreds of them in different colors.
Harmless Traps: Have floor traps which light up on contact. You can have an entire disco floor like this.
Strobe Light: Place a rotating shutter or spin a bullseye lantern around at high speed for instant strobe effects.
I hope this works.