Possible Clues:

• "Dr." of hip-hop
• Beats Electronics co-founder
• Eminem collaborator
• Beats by ___ (audio brand)
• '___ Day' (1993 rap hit)
• Rapping 'Dr.'
• Bow's husband on 'Black-ish'
• Beats by __: audio equipment brand
• "The Chronic" Dr
• Hip-hop's Dr. ___