These are the portions of the State’s Freedom of Information Act related to public bodies, and the recording of meetings:

(5 ILCS 120/1.02) (from Ch. 102, par. 41.02)
Sec. 1.02. For the purposes of this Act:
“Meeting” means any gathering, whether in person or by video or audio conference, telephone call, electronic means (such as, without limitation, electronic mail, electronic chat, and instant messaging), or other means of contemporaneous interactive communication, of a majority of a quorum of the members of a public body held for the purpose of discussing public business or, for a 5-member public body, a quorum of the members of a public body held for the purpose of discussing public business.
Accordingly, for a 5-member public body, 3 members of the body constitute a quorum and the affirmative vote of 3 members is necessary to adopt any motion, resolution, or ordinance, unless a greater number is otherwise required.
“Public body” includes all legislative, executive, administrative or advisory bodies of the State, counties, townships, cities, villages, incorporated towns, school districts and all other municipal corporations, boards, bureaus, committees or commissions of this State, and any subsidiary bodies of any of the foregoing including but not limited to committees and subcommittees which are supported in whole or in part by tax revenue, or which expend tax revenue, except the General Assembly and committees or commissions thereof. “Public body” includes tourism boards and convention or civic center boards located in counties that are contiguous to the Mississippi River with populations of more than 250,000 but less than 300,000. “Public body” includes the Health Facilities and Services Review Board. “Public body” does not include a child death review team or the Illinois Child Death Review Teams Executive Council established under the Child Death Review Team Act, an ethics commission acting under the State Officials and Employees Ethics Act, a regional youth advisory board or the Statewide Youth Advisory Board established under the Department of Children and Family Services Statewide Youth Advisory Board Act, or the Illinois Independent Tax Tribunal.
(Source: P.A. 97-1129, eff. 8-28-12; 98-806, eff. 1-1-15.)

(5 ILCS 120/2.05) (from Ch. 102, par. 42.05)
Sec. 2.05. Recording meetings. Subject to the provisions of Section 8-701 of the Code of Civil Procedure, any person may record the proceedings at meetings required to be open by this Act by tape, film or other means. The authority holding the meeting shall prescribe reasonable rules to govern the right to make such recordings.
If a witness at any meeting required to be open by this Act which is conducted by a commission, administrative agency or other tribunal, refuses to testify on the grounds that he may not be compelled to testify if any portion of his testimony is to be broadcast or televised or if motion pictures are to be taken of him while he is testifying, the authority holding the meeting shall prohibit such recording during the testimony of the witness. Nothing in this Section shall be construed to extend the right to refuse to testify at any meeting not subject to the provisions of Section 8-701 of the Code of Civil Procedure.
(Source: P.A. 94-1058, eff. 1-1-07.)

(5 ILCS 120/2.06) (from Ch. 102, par. 42.06)
Sec. 2.06. Minutes; right to speak.
(a) All public bodies shall keep written minutes of all their meetings, whether open or closed, and a verbatim record of all their closed meetings in the form of an audio or video recording. Minutes shall include, but need not be limited to:
(1) the date, time and place of the meeting;
(2) the members of the public body recorded as either present or absent and whether the members were physically present or present by means of video or audio conference; and
(3) a summary of discussion on all matters proposed, deliberated, or decided, and a record of any votes taken.

(Emphasis Added)