Melodious warbler / Orpheusspötter (Hippolais polyglotta)

Wikipedia: Melodious warbler Source: OTHER 1200px-Hippolais_polyglotta.jpg
Classification: Genus Hippolais; Subfamily Acrocephalinae; Family Old world warblers (Sylviidae)
Looking for it in Kaltbrunnenriet - didn't find it in June 2022.
Etymology: polyglotta is from Ancient Greek polus, "many", and glossa, "tongue" and means "harmonious". [Link]
Yellow belly, brown back, very similar to Icterine warbler.
Appearance and identification: Ebird: Compared to Icterine Warbler, wings are shorter and lack the pale panel. [Link]
Habitats: Agricultural

Song: Repeats bits 6-9 times, makes pauses, but also sings like mad with a distorted chirpy voice. Sometimes sings a descending trill that could be a giveaway. Can sing low (2k) or fairly high (8k)
Song attributes: Melody: improvised melodic, very fast, Frequency: 2-8 KHz Special sounds: trill
XC572815 - Melodious Warbler - Hippolais polyglotta - song recorded in the Netherlands.
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Only documented observation: 2022-06-04