Lesser whitethroat / Klappergrasmücke (Sylvia curruca)

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Wikipedia: Lesser whitethroat
Classification: Genus Sylvia; Subfamily Sylviinae; Family Old world warblers (Sylviidae)
Had hoped to hear and see it in Toggenburg but I didn't; said to be possible in Engadin.
Song: Klappernd. (Müllerchen) An Berglaubsänger erinnernd. Klappertöne (5-8) Aber oft mit leisem schwatzendem Vorgesang, der fehlen kann. Kann auch an Sumpfmeise erinnern, doch sind bei dieser die Klappertöne mehr von oben her angeschlagen. [Link]
Song typically consists of two parts. An indistinct chattering and warbling, subsong-like part similar to Whitethroat, which is usually followed by a dry, fast and rattling trill. The trill carries much further than the chattering part. May be difficult to identify if trill is omitted. [Link]
Calls: „tze“ oder „tett“ [Link]
Warning call a hard "check" similar to Blackcap but slightly softer. [Link]
Physical details: length=12-13 cm, wingspan=16-20 cm, weight=10-14 g
Song: Song typically consists of two parts. An indistinct chattering and warbling, subsong-like part similar to [common] Whitethroat, which is usually followed by a dry, fast and rattling trill. The trill carries much further than the chattering part. May be difficult to identify if trill is omitted. [Link]
Song attributes: Melody: simple rhythmic, slow, Frequency: 3-5 KHz Special sounds: trill
Call: BirdID says: Warning call a hard "check" similar to Blackcap but slightly softer

♫ (call)

Call attributes: Call melody: one note, slow, Frequency: 2-7 KHz, Special sounds: sputter/pebble-clatter