ˌɔn sˌiːdˈiːz ɐ pɹˈæktɪs ðæt kəntˈɪnjuːz tədˈeɪ, ɐ sˈɛkʃən ʌv vˈɛɹiɪŋ sˈaɪz ɪz tˈeɪkən ˌaʊɾəv ðə spˈaɪn ʌvðə dʒˈuːəl kˈeɪs ænd ɪts pˈeɪpɚ tɹˈæk lˈɪstɪŋ.
On CDs (a practice that continues today), a section of varying size is taken out of the spine of the jewel case and its paper track listing.