"Good" is gonna be pretty subjective if you're not into deathcore, for instance. But:
• Paleface (deathcore/beatdown)
• Freddy Dredd (rap)
• Ghost (melodic rock)
• Current Value (breakcore)
• B-Complex (drum & bass)
• Stan Christ (dark techno)
• The Agony Scene (metalcore)
• Headhunterz (hardstyle)
• Ashbury Heights (goth rock)
• Psyclon Nine (aggrotech)
• Solitary Experiments (darkwave/industrial)
• X-RX (aggrotech/industrial)
• Eisbrecher (DNH/industrial rock)
• Woods of Ypres (melodic black metal)
• Belphegor (black metal)
• Ingested (death metal)
• Cephalotripsy (slam/death metal)
• NMS04 (nu/alt metal)
Should cover most genres I enjoy that aren't super mainstream or well-known pop and artists.