Tune learners! Second instrument players! Join Irish music duo Matt and Shannon Heaton for their weekly guided session. This week's hour of moderately paced music will feature performers from the  18th Annual Boston Celtic Music Fest, taking place this weekend at Club Passim in Cambridge. Find more information on the regular session here: https://shannonheatonmusic.com/instruction; find the BCMFest schedule here: https://www.passim.org/.../festivals_summer.../bcmfest-2021/ Join the session at this YouTube link: https://youtu.be/g1eR5V0CEEI Cost is free, but the Heatons say if you are still being…