These are perfume materials that have been used since ancient times and often for medicinal and spiritual purposes. Both are listed in the Bible as components of the incense to be burned before the tabernacle. Both used in modern perfumes of the Chypre type, adding a deep balsamic and woody lingering quality. I happen to have some Labdanum essential oil so I tried a drop on my skin, it is intensely woody, smokey, sweet and resinous and seems to have a strongly calming effect. Galbanum and Labdanum are used as a remedy to counter anxiety, not surprisingly. If perfume is for the purpose of making the wearer feel good, these ancient perfume materials are the ones that truly fulfill that function. The old method of gathering labdanum is to herd goats among the bushes, their woolly coats gathering the resinous material. Labdanum is said to have a deep effect on the subconscious, calling forth memories and moods. Galbanum has a very similar but with a more "green" scent profile; it was highly valued by the ancient Eygptians who steeped ceremonial accessories into it.
Above, dried Galbanum from the Swedish Museum of Natural History - Linnean Garden