-\f[C]track\f[]: Title of the track \- \f[C]track_number\f[]: Number of
-the track within an album or a disc \- \f[C]track_id\f[]: Id of the
-track \- \f[C]artist\f[]: Artist(s) of the track \- \f[C]genre\f[]:
-Genre(s) of the track \- \f[C]album\f[]: Title of the album the track
-belongs to \- \f[C]album_type\f[]: Type of the album \-
-\f[C]album_artist\f[]: List of all artists appeared on the album \-
-\f[C]disc_number\f[]: Number of the disc or other physical medium the
-track belongs to \- \f[C]release_year\f[]: Year (YYYY) when the album
-was released
+\f[C]track\f[] (string): Title of the track \- \f[C]track_number\f[]
+(numeric): Number of the track within an album or a disc \-
+\f[C]track_id\f[] (string): Id of the track \- \f[C]artist\f[] (string):
+Artist(s) of the track \- \f[C]genre\f[] (string): Genre(s) of the track
+\- \f[C]album\f[] (string): Title of the album the track belongs to \-
+\f[C]album_type\f[] (string): Type of the album \- \f[C]album_artist\f[]
+(string): List of all artists appeared on the album \-
+\f[C]disc_number\f[] (numeric): Number of the disc or other physical
+medium the track belongs to \- \f[C]release_year\f[] (numeric): Year
+(YYYY) when the album was released