Based on the passage below, arrange the events in chronological order from earliest to latest.
Before sound archivist Elena Rostova cataloged the rare wax cylinder recordings of Baltic folk songs in 2018, her investigation required reconstructing their origin. In 1935, ethnomusicologist Karlis Ozols had recorded the villagers of Kuldīga on-site. However, prior to Ozols's field expedition, local teacher Marta Liepiņa had compiled handwritten song transcripts in 1928, which later guided Ozols’s travel itinerary. Decades after the recording sessions, in 1972, the wax cylinders were transferred to a regional museum vault to prevent degradation during structural renovations. Only after Rostova unearthed these cylinders from the vault did she cross-reference them with Liepiņa’s initial transcripts.
- 1Marta Liepiņa compiles handwritten song transcripts in Kuldīga.
- 2Karlis Ozols records the villagers on wax cylinders.
- 3The wax cylinders are transferred to a regional museum vault.
- 4Elena Rostova cataloged the rare wax cylinder recordings.