There aren't many songs in which lawyers are portrayed in a positive light. At best, lawyers are mentioned in order to depict someone in dire straits and desperate for legal help (see Warren Zevon's Lawyers, Guns & Money). At worst, lawyers are scapegoats for all of society's ills (see Tom Paxton, One Million Lawyers).
The song My Attorney Bernie, by Dave Frishberg, is an exception. One of the better renditions of this song is here, by Blossom Dearie.
In US: must be an attorney licensed and in good standing in any state, territory or DC.
Outside US: must be a lawyer or equivalent (eg counselor, barrister, advocate, solicitor), duly educated and licensed/accredited and in good standing.
As a general rule, experienced and currently practicing lawyers, and those teaching law in the legal academy, are more likely to be admitted.