Oops, big boo boo. The abc file I posted sounds OK but the Notation isn't. The key signature should be 2/4 and the anacrusis or upbeat is missing. This is what it should be and it was a pain getting there.

X:1
T:Waytobehappy
M:2/4
L:1/8
K:F
C|FE G>F|E D G>A|cB DE|GF C>C|FE G>F|ED G3/2A/|cB DE2<|F2 :||
G|Gc c>d|c=B B3/2=B/|AG D_E2<|=E2 G|Gc c=B|dc =BA|G^F =FD2<|C2 C|
FE G>F|ED G>A|cB DE|GF C>C|FE G>F|ED G3/2A/|cB D
If every file needs this kind of editing someone has a load of work to do.