The Air Guitaremote requires a player to unlock at least 500 songs in the RuneScapeMusic Player, and it features the player rocking out on an air guitar. The emote even plays 5 notes when activated. The player must have been a member to have unlocked the number of music tracks required. However, a former member can perform this emote on an free-to-play world if said player has already fulfilled the 500 track criteria.
Players trying to get 500 songs should do quests or train Dungeoneering; there are 10 "combat tracks" plus several boss tracks in each floor environment, making it a fast way to unlock this emote.