First three notes of Michael Row the Boat ashore for starters! Can't beat experimenting, also, it helps singing with people who can do it, it rubs off, like training your ears...........get a J-girls cd and sing along with it, better still go along and see them and join in (if you're allowed) Then go see Finn & Haddie, and join in, great you're off then! For the UK there are many, you could get our cd, there are loads of spaces to fill in whilst you're driving about!!!! Anyway, the way I do it is by experimenting singing along with other cd's, even our own (which drives the family mad)to find new harmony lines, it is always work in progress as far as I am concerned..........on the other hand Martin sight reads so he dreams up the harmony and sings it and drags me along with him or usually fills the gaps I leave! Work work work work work at it, when the penny drops it is a joy..........................talking of Joy, you might even get the chance to sing with the J-Girls and Finn & Haddie