Yes, there are techniques that can be used to try to obscure the original source of a song in order to use music without permission. However, these techniques usually involve some level of modification to the song, but may still face legal and ethical issues. Here are some common methods: 1. **Audio processing**: Modifying music by changing the pitch, speed, or adding effects (such as reverb, echo) so that the original source is not easily identifiable. 2. **Editing and remixing**: Cutting up the original song into fragments and rearranging it, or mixing different song elements together to form new musical material. 3. **Background noise overlay**: Adding background noise or other sound effects over the original music to make it difficult to recognize. 4. **Imitation and remake**: Musicians may create a new version that imitates the style of the original work but does not copy its direct elements. However, regardless of the technique used, these methods may still infringe copyright and may lead to legal prosecution. Copyright laws in most countries protect the originality of musical works, so it is best practice to obtain appropriate authorization and permission when using other people's music. This is not only out of respect for the creator, but also to avoid potential legal liability.