This bill establishes the Maine Sentencing Guidelines Commission to develop, adopt and modify sentencing guidelines for murder and Class A, B and C crimes to maintain uniformity, proportionality, rationality and predictability in sentencing similarly situated persons for similar crimes. The commission consists of 19 members including the Chief Justice of the Supreme Judicial Court or the Chief Justice's designee and other members of the judiciary, the Commissioner of Corrections or the commissioner's designee, the Commissioner of Public Safety or the commissioner's designee, prosecuting and defense attorneys, a probation and parole officer, 3 members of the public, one of whom is a victim of a Class A, B or C crime, experts in mental health issues and substance use disorder, formerly incarcerated persons and representatives of statewide organizations focusing on legal aid, restorative justice and civil rights. The sentencing guidelines are advisory and do not create a right for the defendant. If the commission determines it is necessary to modify a guideline that results in the reduction of any sentence or in the early release of any inmate, the commission is required to notify the Legislature. The commission also serves as a clearinghouse and information center for the collection, preparation, analysis and dissemination of information on state and local sentencing practices and conducts ongoing research regarding sentencing guidelines, use of imprisonment and alternatives to imprisonment, plea bargaining and other matters relating to the improvement of the criminal justice system.