I've listed below the criteria which must be met to be eligible for each category of CMA Award.
Entertainer of the Year:
This award is for the act displaying the greatest competence in all aspects of the entertainment field. Voter should give consideration not only to recorded performance, but also to the in-person performance, staging, public acceptance, attitude, leadership, and overall contribution to the Country Music image. Award to artist.
Male Vocalist of the Year:
This award is based on individual musical performance on records or in person. Award to artist.
Female Vocalist of the Year:
This award is based on individual musical performance on records or in person. Award to artist.
Vocal Group of the Year:
A group is defined as an act, composed of three (3) or more people, all of whom normally perform together and none of whom is known primarily as an individual performing artist. This award is based on the musical performance of the group as a unit, either on records or in person. Award to group.
Vocal Duo of the Year:
A duo is defined as an act composed of two people, both of whom normally perform together and neither of whom is known primarily as an individual performing artist. This award is based on the musical performance of the duo as a unit, either on records or in person. Award to duo.
Album of the Year:
This award is for an album as a whole unit. The album should be judged on all aspects including, but not limited to, artist's performance, musical background, engineering, packaging, design, art, layout, and liner notes. At least 60% of the product in the album must have been first mastered or released domestically during the eligibility period. Award to artist and producer(s).
Song of the Year:
This award is for the songwriter(s). Any Country Music song with original words and music is eligible based upon the song's Country singles chart activity during the eligibility period. Award to songwriter(s) and primary publisher(s).
Single of the Year:
This award is for single records only. The single must have been released domestically for the first time during the eligibility period. Tracks from albums are not eligible unless released as a single during the eligibility period. Award to artist and producer(s).
Vocal Event of the Year:
An event is defined as a collaboration of two or more people either or all of whom are known primarily as individual artists. They must have performed together, as a unit, on a musical recording released domestically within the eligibility period with each artist prominently featured and duly authorized to receive billing on the event. Award to each artist.
Musician of the Year:
This award is for a musician known primarily as an instrumental performer. In order to qualify, a musician must have played on at least one album or single which has appeared in the top ten of the County album or singles charts from BILLBOARD, THE GAVIN REPORT or RADIO & RECORDS during the eligibility period. Award to musician.
Horizon Award:
This award is to the artist, whether individual or a group of two or more, who has for the first time demonstrated in the field of Country Music the most significant creative growth and development in overall chart and sales activity, live performance professionalism, and critical media recognition. Any artist is ineligible for nomination who has previously won a CMA Award (except Song Of The Year, Vocal Event of the Year and Video of the Year) or who has twice been a final nominee for the Horizon Award. Award to artist.
Music Video of the Year:
This award is for an original music video not more than ten (10) minutes in length featuring the performance of not more than one (1) song or medley. The video must have been first released domestically for exhibition or broadcast during the eligibility period. The video should be judged on all audio and video elements including, but not limited to, the artist's performance, video concept and production. Award to artist and director.