Systems, methods, and computer-readable products for track selection

A system for selecting a plurality of tracks, the system comprising at least one processor configured to:

• receive, from a client device associated with a user, a plurality of request parameters;
• load, from a database, based on the request parameters:
• a plurality of bans,
• a plurality of history track attributes, and
• a plurality of artist identifiers;
• calculate a most recent discovery track based on the plurality of histories and the plurality of artist identifiers, wherein a discovery track is a history track that, based on play history information, has not been played back by the user;
• repeatedly select a selected artist identifier from the plurality of artist identifiers and a track type from a set of track types until a predetermined number of artist identifier and track type pairs have been selected;
• load, from the database, a plurality of candidate tracks for each selected artist identifier;
• repeatedly select one track of the plurality of candidate tracks for each artist identifier and track type pair until one track has been selected for each pair of the predetermined number of artist identifier and track type pairs, wherein the at least one processor being configured to repeatedly select the one track of the plurality of candidate tracks further includes the at least one processor being configured to select a most recent unexamined history track as the most recent discovery track;
• and
• return, to the client device, the predetermined number of tracks that have been selected.

A non-transitory computer-readable storage medium having stored thereon one or more sequences of instructions for causing one or more processors to perform:

• receiving, from a client device associated with a user, a plurality of request parameters;
• loading, from a database, based on the request parameters:
• a plurality of bans,
• a plurality of history track attributes, and
• a plurality of artist identifiers;
• calculating a most recent discovery track based on the plurality of history track attributes and the plurality of artist identifiers, wherein a discovery track is a history track that, based on play history information, has not been played back by the user;
• repeatedly selecting a selected artist identifier from the plurality of artist identifiers and a track type from a set of track types until a predetermined number of artist identifier and track type pairs have been selected;
• loading, from the database, a plurality of candidate tracks for each selected artist identifier;
• repeatedly selecting one track of the plurality of candidate tracks for each artist identifier and track type pair until one track has been selected for each pair of the predetermined number of artist identifier and track type pairs, wherein repeatedly selecting the one track of the plurality of candidate tracks further includes selecting a most recent unexamined history track as the most recent discovery track;
• and
• returning, to the client device, the predetermined number of tracks that have been selected.