Sections
constructor(start: Double? = null, duration: Double? = null, confidence: Double? = null, loudness: Double? = null, tempo: Double? = null, tempoConfidence: Double? = null, key: Int? = null, keyConfidence: Double? = null, mode: Int? = null, modeConfidence: Double? = null, timeSignature: Int? = null, timeSignatureConfidence: Double? = null)