An article comprising: a food or beverage container, or a portion thereof, having: a metal substrate; and a coating composition applied on at least a portion of the metal substrate, the coating composition comprising: a polyether polymer that includes at least 25% by weight of aryl or heteroaryl groups, wherein the polymer is substantially free of bound bisphenol A, bisphenol F, bisphenol S, polyhydric phenols having estrogenic activity greater than or equal to that of bisphenol S when tested using the MCF-7 assay, and epoxides thereof; wherein the polyether polymer is formed by reacting ingredients including: (i) an extender and (ii) a diepoxide compound, wherein the extender or diepoxide compound, or both, includes one or more segments of the below Formula: wherein: each of the oxygen atoms depicted in Formula is present in an ether or ester linkage; v is independently 0 to 4 when t is 0 and v is independently 0 to 3, when t is 1; w is 4; when t is 1 each of the phenylene groups depicted in Formula includes at least one Hydrogen atom attached to the ring at an ortho position relative to the depicted oxygen atoms; each R 1, if present, is independently an atom or group having an atomic weight of at least 15 Daltons that is substantially non-reactive with an epoxy group; R 2, if present, is a divalent group; n is 0 or 1; with the proviso that if n is 0, the phenylene groups depicted in Formula can optionally join to form a fused ring system in which case w is 3 and v is 0 to 2; t is 0 or 1; and two or more R 1 and/or R 2 groups can join to form one or more cyclic groups. a metal substrate; and a coating composition applied on at least a portion of the metal substrate, the coating composition comprising: a polyether polymer that includes at least 25% by weight of aryl or heteroaryl groups, wherein the polymer is substantially free of bound bisphenol A, bisphenol F, bisphenol S, polyhydric phenols having estrogenic activity greater than or equal to that of bisphenol S when tested using the MCF-7 assay, and epoxides thereof; wherein the polyether polymer is formed by reacting ingredients including: (i) an extender and (ii) a diepoxide compound, wherein the extender or diepoxide compound, or both, includes one or more segments of the below Formula: wherein: each of the oxygen atoms depicted in Formula is present in an ether or ester linkage; v is independently 0 to 4 when t is 0 and v is independently 0 to 3, when t is 1; w is 4; when t is 1 each of the phenylene groups depicted in Formula includes at least one Hydrogen atom attached to the ring at an ortho position relative to the depicted oxygen atoms; each R 1, if present, is independently an atom or group having an atomic weight of at least 15 Daltons that is substantially non-reactive with an epoxy group; R 2, if present, is a divalent group; n is 0 or 1; with the proviso that if n is 0, the phenylene groups depicted in Formula can optionally join to form a fused ring system in which case w is 3 and v is 0 to 2; t is 0 or 1; and two or more R 1 and/or R 2 groups can join to form one or more cyclic groups. each of the oxygen atoms depicted in Formula is present in an ether or ester linkage; v is independently 0 to 4 when t is 0 and v is independently 0 to 3, when t is 1; w is 4; when t is 1 each of the phenylene groups depicted in Formula includes at least one Hydrogen atom attached to the ring at an ortho position relative to the depicted oxygen atoms; each R 1, if present, is independently an atom or group having an atomic weight of at least 15 Daltons that is substantially non-reactive with an epoxy group; R 2, if present, is a divalent group; n is 0 or 1; with the proviso that if n is 0, the phenylene groups depicted in Formula can optionally join to form a fused ring system in which case w is 3 and v is 0 to 2; t is 0 or 1; and two or more R 1 and/or R 2 groups can join to form one or more cyclic groups.