I’m not familiar with Magnus Ringbloom, however just listened to a little of the Gotland Sessions. As I understand it, you’re looking for a subset of jazz characterized as Cool Jazz. This was a late 40’s to mid 50’s style.
Miles Davis Album Kind of Blue typifies this genre. Someone above also stated Chet Baker’s album Chet. This is another good example. More importantly to get beyond the narrow band of jazz music classified as Cool, you can look for musicians or groups who play Ballads. These are down tempo by nature, so have more if the relaxed approach typical in Cool.
Hope you find this helpful. Enjoy your jazz journey!