1. Method of organising content items, including: in a multimedia reproduction device for rendering a signal in a content item, obtaining information associating each of a first and at least one further label with respective sets of a number of first content items, wherein at least one first content item is associated with the first label in response to user input; obtaining a second content item; for each of the first and further labels, determining any uneven distribution of feature vectors characterising first content items associated with a label over a feature space by calculating a similarity measure between a feature vector characterising the second content item and each of the feature vectors characterising first content items associated with the label; and associating the first label with the second content item upon determining that the second content item is similar to the first content items associated with the first label, according to calculated values of the similarity measure.