If anactivity,book, etc.repaysyoureffort,time,attention, etc., it isworththeeffortortime, etc. that youspendon it:
You shouldreadthisarticle- it wouldrepayyourtime.
If youthinkof thesechildrengrowingintoadultswhoenjoyandappreciateclassicalmusic, then thatrepaysoureffort.