Depends what you're into. I listen to a lot of dubstep/drum and bass/electro, mainly underground (so if you ask why I didn't list 13 Skrillex songs its cuz I don't listen to him anymore, once you've gear one song you've heard em all)
Anyway. Relaxing music (chillstep & other)
-Pastense by John Caza
-Wildlife by Fracture
-Search YouTube for MrSuicideSheep, he's got good songs on his page and hour+ long mixes that I listen to while studying (MrSuicideSheep is not an artist, just a youtuber who spotlights music)
Heavy drops without the ear screeching Skrillex sound include:
-Mitis - pretty much any song by him. I like "shapes and sizes" he also has some chillstep songs too
-could go with excision, but he's not my fav.
-Arkasia did a great remix of the song "Satellite" starts soft and hits an amazingly melodic drop
If you like vocals you can go with Adventure Club, they've got some great songs

Krewella is good too. Check both of them out on Facebook (or just YouTube songs) Tristam is more of make vocals with a decent drop in his songs. Adventure time by Rogue is such a happy song in my opinion haha
Seriously, give these artists a shot. Every one of them. If you're disappointed in them I'm sorry I wasted your time but you most likely wont be

also pretty much all of these artists give away their music for free!

so grab the track/album if you enjoyed it

If you have semi-decent headphones or speakers:
-Introvert by Koan Sound (Vexisle remix)
^^^this song is literally liquid bass. It blew my mind when I heard it (also a free download!

)
Have fun