17,1 iMac, 10.14.4, booted from 128gb SSD card, Music Library stored on internal 2TB hd. I have told iTunes where the "iTunes Media" folder in on the 2TB internal drive. Most tracks play fine from a 4,000 track library. But the only way for iTunes to recognize two music files I have made, is to manually double click the tracks on the 2TB hd, then iTunes on the 128SSD card sees the two files. Why is this? The two tracks are MPEG audio files, 192 bit rate, 44.1 kHz, stereo, id3 tag v2.2, encoded w iTunes 220.127.116.11. Also booting from the 128SSD card Mojave iTunes imports audiobook tracks stored on the 2TB hd in the "iTunes Media" folder, but half the tracks are unplayable. ALL these tracks play in Column View w Finder. I tested them. Is Mojave iTunes screwing up? or me?