Boomytunes.com has a range of play-along videos for use with xylophones and glockenspiels. There is some free content but for full access there is a yearly subscription fee which will also allow you access to download the videos that you want to use.

This is a great YouTube channel with a wide range of different videos using a range of different musical instruments. Here I have featured some of the Orff Xylophone teaching materials that Tyler Swift has created for use in his elementary music programme. My students love these and they can be modified to give both instant success to the younger students and extension opportunities to challenge the older and more advanced students.

The sheet music for many of the featured arrangements is available here: https://www.teacherspayteachers.com/Store/Swicks-Classroom