i think if you did what puffy use to do then no you cant copyright the track but if you did what just blaze did with the oh boy track then why cant you all you got to do is describe what you use and how its different from the original check below...i could be wrong but we will get to the bottom of this Big Tracks and maybe somebody will learn something......................Space 6: Derivative Works
A derivative sound recording is one which incorporates some preexisting sounds--sounds which were previously registered, previously published, or which were fixed before February 15, 1972. Registration for a derivative work must be based on the new authorship that has been added. When a work contains preexisting sounds, Space 6 of the application must contain brief, general descriptions of both the preexisting material (Space 6a) and the added material (Space 6b).
For example, Fine Sounds Corporation issues a CD-album containing 16 selections, 2 of which were published last month as singles. On the application for registration of the sounds on the album, the following statement might be given in Space 6a: "sounds for tracks 1 and 3, previously published." The new material might be described in Space 6b as "sounds for 8 tracks" or "sounds for 8 selections."
In cases where the preexisting sounds themselves have been altered or changed in character, Space 6b should be used to describe in more precise terms the engineering techniques involved. For example, Educational Records, Inc., remixes the original tracks of a previously released recording of a Beethoven symphony. Space 6a should identify the preexisting material as "sounds previously published." Space 6b might indicate "remixed from multitrack sound sources" or "remixed sounds." This new material must result from creative new authorship rather than mere mechanical processes; if only a few slight variations or purely mechanical changes (such as declicking or remastering) have been made, registration is not possible.