Saxophonist Maria is improvising over Joe Henderson’s classic jazz standard “Recorda-Me.” I asked her whether she would use the Dorian or Aeolian mode over the first 4 bars.
As shown below, the Aeolian is the mode rooted on LA, so it uses a lowered 6th degree. By contrast, the Dorian is rooted on RE, so it features a raised 6th degree.