The categories are - Most Popular Singapore Artiste, Most Popular Singapore song, Most Popular Regional Artiste and Most Popular Regional Song.
This year's competition sees a stronger Singapore presence in the "Most Popular" categories, with local singers like Hady Mirza and Taufik Batisah competing in the Most Popular Regional Artiste category as well as Didicazli in the Most Popular Regional Song category.
They are going up against some of the biggest names in the Malay music industry, such as pop diva Siti Nurhaliza and rocker Faizal Tahir.
Those who wish to vote for their favourite artistes can do so here.
Voting closes at midnight, July 11 (Singapore time).
Organised by Singapore radio stations Ria 89.7FM and Warna 94.2FM, Anugerah Planet Muzik 2011 marks the tenth anniversary of the APM and the 75th anniversary of Singapore radio.
It features some modified categories to encourage greater participation from the region's artistes, as well as performances by Malay music superstars Rossa and Ning Baizura.
This year's APM will be held on July 15, at the Singapore EXPO's MAX Pavilion.