Common nightingale / Nachtigall (Luscinia megarhynchos)

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Luscinia megarhynchos - common nightingale in Wikipedia.
Classification: Genus Luscinia; Family Thrushes (Turdidae)
General:

The common nightingale, rufous nightingale or simply nightingale (Luscinia megarhynchos), is a small passerine bird best known for its powerful and beautiful song. It was formerly classed as a member of the thrush family Turdidae, but is now more generally considered to be an Old World flycatcher, Muscicapidae.^[2] It belongs to a group of more terrestrial species, often called chats. [more]
Vocalization:

It consists of extremely resonant, full-bodied notes and lacks the, dry, rolling, rattling sounds of T.N. Most distinct species specific sound is the interwoven series of slightly ascending, plaintive notes (0.04 - 0.10 in recording). May mimic Thrush Nightningale!. [Link]
Song:

The song is the best characteristic to separate it from T. Nightingale. [Link]
Calls:

Alarm call either a thin, flycatcher-like "weeet", or a Chiff-chaff-like "piuu". Also a characteristic (but similar to Thrush Nighitingale) dry, rattling, frog-like "rrrrr". [Link]
Physical details: length=16 cm, wingspan=23-26 cm, weight=17-24 g
Habitats: Wetland

Song: Can be a sequence of unrelated weird but musical sounds - trills, churrs, human-like whistles - very amusing.
Song attributes: Melody: improvised melodic, slow, Frequency: medium (1-5 KHz) Special sounds: trill, whoop, weird Singing season: 04-15 - 06-30
♫ Spain (song)