Organisers have added the pair to the line up of the show on Saturday 27th July at Lydiard Park.
Better known as Jason Hayward and Russell Small, Phats & Small are famous for their 1999 hit Turn Around, which reached number two in the UK charts before becoming an international success.
The pair still record today, and are renowned on the club scene for their exciting remixes which often feature classic songs.
The full line-up for the festival is expected to be released on Friday March 22nd where there is expected to be some local acts joining the bill.
The MFOR Music Festival takes place on Saturday July 27th. Gates open at midday and the finish time is 10:30pm.
Ticket prices are tiered – the earlier a ticket is booked, the cheaper the price.
Tickets booked up to Sunday March 31st are £32.99 for adults (aged 14 upwards), rising then to £37.99 until the end of May. Children’s tickets are £9.99 (aged five to 13 inclusive) rising to £12.99. Under fives go free – one young child per full-paying adult. VIP tickets for fast track access and extra benefits are £70 each. Information and tickets are available on the website.