Can someone tell me what do the symbols here mean? and how to play them in triplets as written in the lead sheet?
A bracket with a 3 above it means play the 3 bracketed notes in the time it would take to play two of that same value note. So here, there's a minim - 2 beats, and then the triplet - consisting of a quaver rest and a crotchet - both of which constitute one beat. Followed by the final crotchet, making the total of 4 beats.
Now, that triplet - how to play? I'd probably count 12 for that bar, to start with. That means the minim gets 6 counts, no.7 is the rest, 8,9,10,11,and 12 are the tied notes at the end. In counting 12, emphasise 1 4 7 and 10, as they are still where the normal 1 2 3 and 4 are. So, put simply - 1st note plays on 1, other note plays on 8.