instruments made of fir wood. The Septuagint reads "with all boldness and with songs". See 2Sa_6:14 and 1Ch_13:8. According to Hebrew text "fir woods", put by Figure of speech Metonymy (of Material) for instruments made from it. App-6.
timbrels = drums. See note on Exo_15:20.
cymbals = timbrels, or tambourines. Hebrew. zilzilim. See note on 1Ch_13:8.