Bemol literally means “flat” in music, a note lowered by a half step. In the song, “que me censuren tiene su bemol” cleverly uses it figuratively to mean that being censored has its downside, while the musical meaning connects with the later image of vibrating strings.
Aterciopelados’ “No Necesito” is a sharp, self-assured refusal to live by other people’s approval. The singer says, “No necesito su aprobación” [I don’t need their approval], because an inner “medidor” [meter or gauge] already measures her own satisfaction. Even censorship has “su bemol” [its flat note, or its downside], a neat musical joke that fits the song’s language of strings, notes, and tuning. She will not be tempted by “el vil metal” [money, literally “base metal”], nor will she “endulzarles la oreja” [sweeten their ear, meaning flatter them or tell them what they want to hear].
The confidence has a darker edge. “No todo es color de rosa” [not everything is rosy], and while her strings vibrate, everything smells as if it “se pudrió” [has rotted]. From “una burbuja” [a bubble] and “mi casa en el aire” [my house in the air], she watches between the lines and expects no improvement. That distance does not make her gentle or optimistic. It lets her reject approval, money, and forced understanding with a blunt answer: her own inner measure is enough.