On the track, niggas can't keep up, they look, they trailin' back
Two things happening here:
“On the track”, meaning on a song, other rappers can’t keep up with him, he’s too good.
Also he’s saying on a race track he’s too fast for other rappers he’s ahead and going for the win
The third meaning is the reference to “bass and treble” on a musical track continuing the theme from the previous line.
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