A composition comprising: A) one or more resin-linear organosiloxane block copolymer compositions comprising: 40 to 90 mole percent disiloxy units of the formula [R 1 2 SiO 2/2], 10 to 60 mole percent trisiloxy units of the formula [R 2 SiO 3/2], 0.5 to 35 mole percent silanol groups [=SiOH]; wherein: each R 1, at each occurrence, is independently a C 1 to C 30 hydrocarbyl, R 2, at each occurrence, is independently a C 1 to C 20 hydrocarbyl; wherein: the disiloxy units [R 1 2 SiO 2/2] are arranged in linear blocks having an average of from 10 to 400 disiloxy units [R 1 2 SiO 2/2] per linear block, the trisiloxy units [R 2 SiO 3/2] are arranged in non-linear blocks having a molecular weight of at least 500 g/mole, and at least 30% of the non-linear blocks are crosslinked with each other, each linear block is linked to at least one non-linear block, and the organosiloxane block copolymer has a weight average molecular weight (M w) of at least 20,000 g/mole; and B) one or more organopolysiloxanes having the formula: [R 2 3 SiO 1/2] c [R 2 2 SiO 2/2] d [R 2 SiO 3/2] e [SiO 4/2] f wherein: each R 2 is independently a C 1 to C 20 hydrocarbyl, and the subscripts c, d, e, and f represent the mole fraction of each siloxy unit present in the organopolysiloxane and range as follows: c is 0 to 0.6, d is 0 to 1, e is 0 to 1, f is 0 to 0.6, with the provisos that d+e+f > 0 and c+d+e+f ≈ 1; wherein the weight ratio of component A) to component B) may vary from 99.5/0.5 to 10/90. A) one or more resin-linear organosiloxane block copolymer compositions comprising: 40 to 90 mole percent disiloxy units of the formula [R 1 2 SiO 2/2], 10 to 60 mole percent trisiloxy units of the formula [R 2 SiO 3/2], 0.5 to 35 mole percent silanol groups [=SiOH]; wherein: each R 1, at each occurrence, is independently a C 1 to C 30 hydrocarbyl, R 2, at each occurrence, is independently a C 1 to C 20 hydrocarbyl; wherein: the disiloxy units [R 1 2 SiO 2/2] are arranged in linear blocks having an average of from 10 to 400 disiloxy units [R 1 2 SiO 2/2] per linear block, the trisiloxy units [R 2 SiO 3/2] are arranged in non-linear blocks having a molecular weight of at least 500 g/mole, and at least 30% of the non-linear blocks are crosslinked with each other, each linear block is linked to at least one non-linear block, and the organosiloxane block copolymer has a weight average molecular weight (M w) of at least 20,000 g/mole; and 40 to 90 mole percent disiloxy units of the formula [R 1 2 SiO 2/2], 10 to 60 mole percent trisiloxy units of the formula [R 2 SiO 3/2], 0.5 to 35 mole percent silanol groups [=SiOH]; wherein: each R 1, at each occurrence, is independently a C 1 to C 30 hydrocarbyl, R 2, at each occurrence, is independently a C 1 to C 20 hydrocarbyl; each R 1, at each occurrence, is independently a C 1 to C 30 hydrocarbyl, R 2, at each occurrence, is independently a C 1 to C 20 hydrocarbyl; wherein: the disiloxy units [R 1 2 SiO 2/2] are arranged in linear blocks having an average of from 10 to 400 disiloxy units [R 1 2 SiO 2/2] per linear block, the trisiloxy units [R 2 SiO 3/2] are arranged in non-linear blocks having a molecular weight of at least 500 g/mole, and at least 30% of the non-linear blocks are crosslinked with each other, each linear block is linked to at least one non-linear block, and the organosiloxane block copolymer has a weight average molecular weight (M w) of at least 20,000 g/mole; and the disiloxy units [R 1 2 SiO 2/2] are arranged in linear blocks having an average of from 10 to 400 disiloxy units [R 1 2 SiO 2/2] per linear block, the trisiloxy units [R 2 SiO 3/2] are arranged in non-linear blocks having a molecular weight of at least 500 g/mole, and at least 30% of the non-linear blocks are crosslinked with each other, each linear block is linked to at least one non-linear block, and the organosiloxane block copolymer has a weight average molecular weight (M w) of at least 20,000 g/mole; and B) one or more organopolysiloxanes having the formula: [R 2 3 SiO 1/2] c [R 2 2 SiO 2/2] d [R 2 SiO 3/2] e [SiO 4/2] f wherein: each R 2 is independently a C 1 to C 20 hydrocarbyl, and the subscripts c, d, e, and f represent the mole fraction of each siloxy unit present in the organopolysiloxane and range as follows: c is 0 to 0.6, d is 0 to 1, e is 0 to 1, f is 0 to 0.6, with the provisos that d+e+f > 0 and c+d+e+f ≈ 1; each R 2 is independently a C 1 to C 20 hydrocarbyl, and the subscripts c, d, e, and f represent the mole fraction of each siloxy unit present in the organopolysiloxane and range as follows: c is 0 to 0.6, d is 0 to 1, e is 0 to 1, f is 0 to 0.6, with the provisos that d+e+f > 0 and c+d+e+f ≈ 1; c is 0 to 0.6, d is 0 to 1, e is 0 to 1, f is 0 to 0.6, with the provisos that d+e+f > 0 and c+d+e+f ≈ 1;