There is not secret for brd songs, just need to focus in 2 things:
- potency: by getting gear gear with "song +x" stats, this should be your basic rule, to get the most higher number of this for diferent and important songs;
- duration: by getting gear with "increase songs duration" stats. Important to avoid the trouble of recasting often, so giving you time to do others functions.
Once you have enough of those and good experience in job, you can add others tasks to your playstayle:
- debuff: by getting gear with "string/singing/wind+x" or the "magic accuracy+x";
- pre cast gear: by getting gear with "song casting-x".
Finally, once you have all this covered, you can start sets like:
- idle/dt/refresh;
- cure pot.
The first 2 points you can achieve primary for instruments, and that should be your starting point. Go to abyssea and get the ballad instrument form t2 vnm in vunkerl, then the minuet instrument from t2 vnm in misareaux, the madrigal/prelude from amon, in attohwa, pans horn from pantokrator in uleguerand. For marches, you can buy an iron ram horn while you keep working in langeleik from caeleno in bastok t4 vwnm.
For gear, focus first in getting your legs (ballad +1), body (minuet +1) and hands (marches+1). Then work for duration gear, by reforging your artifact feet, can be nq version, farming aoidos mantinee from cat in aby vunkerl, buy a legato dagger and slowly progress a marduk legs +1. Those are all the max duration you can get by gear, and will result in +7 mins songs with nitro, and thats your starting point, and the first thing you should worry.