A VIP (Variation In Production) is a piece of music which has been altered from its original state by the original producer by adding, removing, and/or changing pieces of the item. It essentially acts as a remix, but the key difference is that VIPs are always made by the producer of the original song. In short, a VIP is when a producer remixes their own track.
To find a VIP, find the artist's name under the alphabetized list. All of the artist's VIPs are listed with their name. For example, Mr FijiWiji's VIP of 'Yours Truly' would be under the 'M' tab, since the artist's name begins with the letter 'M'.