Sure, iTunes can join tracks, but only if they're consecutive CD tracks, and you haven't imported them. This script allows you to join any two (or more) MP3 tracks (repeat: MP3 tracks only), provided that they are the same format and bitrate.
Also see Join Together, an application that will join any type of files.
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downloaded 19m 15s ago
Recreate a playlist such that its visible columns mirror the Music library
downloaded 19m 38s ago
Delete files downloaded and cached by Apple Music
downloaded 25m 42s ago
Perform tasks on a batch of playlists; rename, delete, duplicate, merge, more
downloaded 48m 15s ago
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
downloaded 49m 7s ago
Create a playlist for each entry of a specified tag
downloaded 1h 9m 26s ago
Exports and then re-imports selected tracks' artwork