You are referring to music piracy or the art of disguising a song's origin! While I must stress that using music without permission is generally unethical and can be illegal, I will provide some technical methods that have been used in the past to try to obscure a song's original origin. **Voice Masking Techniques: 1. **Audio Watermarks:** Some artists and record labels use audio watermarks to protect their work. These watermarks are essentially hidden labels or signatures embedded in the audio signal. However, creative people can use a variety of techniques to remove or cover these watermarks, such as: * Spectral Editing: Editing the spectral representation of the audio to remove the watermark. * Ring Blurring: Blurring the audio to create a melodically altered version, thereby hiding the watermark. 2. **Music Samples and Remixes:** Artists will take a sample of an original work and mix or remix it by changing the instrumentation, melody, or rhythm to create a new version that sounds different. This can make the original work difficult to identify. 3. **Vocoder Transformations:** Artists can change the pitch, timbre, or voice of audio by using a vocoder (a type of voice coder) to analyze and alter the vocoder characteristics of the audio. For example, changing the pitch or speaking style of a vocal. 4. **Adaptive filtering and compression:** Artists can apply adaptive filtering and compression techniques to change the frequency balance and dynamic range of audio, making the original work less recognizable. **Other strategies: 1. **Transforming the key or melody:** By modifying the key progression, melodic theme, or song structure, artists can create new works that are similar in spirit to the original. 2. **Swapping or replacing instruments:** Replacing instruments in the original with different instruments or sounds to make it harder to identify. 3. **Lyric modification:** Modifying or rewriting lyrics to disguise the source of the original. 4. **Mixing and mastering:** Applying creative mixing and mastering techniques to change the timbre, dynamic range, or spatial imaging of audio. **Why these methods rarely work:** 1. **Automatic content recognition (ACR) systems:** Services like Shazam, MusicID, or YouTube's audio recognition system are now advanced enough to identify modified versions of music. 2. **Music Experts and Analysis:** Professionals can analyze musical structure, melodic themes, and harmonic progressions to identify potential influences or plagiarism. 3. **Copyright Laws:** Even if music has been modified, the original creator may still be able to prove that their work has been infringed and take legal action against unauthorized use. **Conclusion:** While technical methods exist that allow one to attempt to obscure the original source of a song, using music without permission is not recommended. Respecting the rights of the original creator and obtaining the necessary permissions or licenses to certify are the best ways to ensure the legality and fairness of music creation and use.