Essential Elements online recordings: http://myeelibrary.com/ , from homepage select “my book doesn’t have a code” and enter the ISBN: 978-0-634-00310-3
helpful videos that cover the basics of each instrument: basicband.info
Exercises that help with music literacy and remembering where notes live on the staff: musictheory.net
musescore.com = a free database of music that is fun to explore