This document goes over how to form the subjunctive, the uses, examples, and Spanish songs that use the imperfect subjunctive.
If your students watch the popular telenovela from Spain, El Internado, they will appreciate the slides that highlight the use of the Imperfect Subjunctive in Season 1 (mainly episode 6).
This file is a PDF of 28 pages. If a google doc works better for you, please let me know and I am happy to send that your way. Thank you! firstname.lastname@example.org