Spek shows a spectrogram of the audio. A genuine 320kbps MP3 will have frequencies smoothly reaching 20.5kHz. A fake 320kbps will show a sharp cut-off at 16kHz (proof of a 128kbps source) or a jagged, blocky pattern.
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If you want legal options to get high-quality (320 kbps) Bollywood tracks, here are lawful alternatives you can use: Spek shows a spectrogram of the audio