Pick the beat style first
Boom-bap is the classic New York sound: dusty drum breaks, a hard kick and snare, a sampled piano or soul loop and a simple bassline, usually around 85 to 95 BPM. Trap is built on a heavy 808, a snappy snare on the third beat and rolling hi-hats, often counted at 130 to 150 BPM but felt half as fast.
Drill shares the 808 and the dark mood with trap but uses sliding 808 bass, staccato hi-hat patterns and a tense minor-key melody, usually around 140 BPM. Melodic hip-hop swaps the aggression for pianos, guitars and soft pads with a lighter beat. Choose one lane per prompt, since the three are rhythmically very different.