"Nad Tatrou sa blýska" (Slovak pronunciation: [ˈnat tatrɔw sa ˈbliːska]; English: "Lightning over the Tatras") is the national anthem of Slovakia. The origins of it are in the Central European activism of the 19th century. Its main themes are a storm over the Tatra mountains that symbolized danger to the Slovaks, and a desire for a resolution of the threat. It used to be particularly popular during the 1848–1849 insurgencies.
 It was one of Czechoslovakia's dual national anthems and was played in many Slovak towns at noon; this tradition ceased to exist after Czechoslovakia split into two different states in the early 1990s with the dissolution of Czechoslovakia.
 23-year-old Janko Matúška wrote the lyrics of "Nad Tatrou sa blýska" in January and February 1844. The tune came from the folk song "Kopala studienku" (English: "She was digging a well") suggested to him by his fellow student Jozef Podhradský, a future religious and Pan-Slavic activist and gymnasial teacher and a similar Hungarian folk song, "Azt mondják, nem adnak engem galambomnak" (English: "They say, they won't let me marry my love"). Shortly afterwards, Matúška and about two dozen other students left their prestigious Lutheran lyceum of Pressburg (preparatory high school and college) in protest over the removal of Ľudovít Štúr from his teaching position by the Lutheran Church under pressure from the authorities. The territory of present-day Slovakia was part of the Kingdom of Hungary within the Austrian Empire then, and the officials objected to his Slovak nationalism.
 "Lightning over the Tatras" was written during the weeks when the students were agitated about the repeated denials of their and others' appeals to the school board to reverse Štúr's dismissal. About a dozen of the defecting students transferred to the Lutheran gymnasium of Levoča. When one of the students, the 18-year-old budding journalist and writer Viliam Pauliny-Tóth, wrote down the oldest known record of the poem in his school notebook in 1844, he gave it the title of Prešporskí Slováci, budúci Levočania (Pressburg Slovaks, Future Levočians), which reflected the motivation of its origin.
 The journey from Pressburg (present-day Bratislava) to Levoča took the students past the High Tatras, Slovakia's and the then Kingdom of Hungary's highest, imposing, and symbolic mountain range. A storm above the mountains is a key theme in the poem.
 No authorized version of Matúška's lyrics has been preserved and its early records remained without attribution. He stopped publishing after 1849 and later became clerk of the district court. The song became popular during the Slovak Volunteer campaigns of 1848 and 1849. Its text was copied and recopied in hand before it appeared in print in 1851 (unattributed, as Dobrovoľnícka – Volunteer Song), which gave rise to some variation, namely concerning the phrase zastavme ich ("let's stop them") or zastavme sa ("let's stop"). A review of the extant copies and related literature inferred that Matúška's original was most likely to have contained "let's stop them." Among other documents, it occurred both in its oldest preserved handwritten record from 1844 and in its first printed version from 1851. The legislated Slovak national anthem uses this version, the other phrase was used before 1993.
 On 13 December 1918, only the first stanza of Janko Matúška's lyrics became half of the two-part bilingual Czechoslovak anthem, composed of the first stanza from a Czech operetta tune, Kde domov můj (Where Is My Home?), and the first stanza of Matúška's song, each sung in its respective language and both played in that sequence with their respective tunes. The songs reflected the two nations' concerns in the 19th century when they were confronted with the already fervent national-ethnic activism of the Hungarians and the Germans, their fellow ethnic groups in the Habsburg monarchy.
 During the Second World War, "Hej, Slováci" was adopted as the unofficial state anthem of the puppet regime Slovak Republic.
 When Czechoslovakia split into the Czech Republic and the Slovak Republic in 1993, the second stanza was added to the first and the result legislated as Slovakia's national anthem.
 Only the first two stanzas have been legislated as the national anthem.
 I
𝄆 Nad Tatrou sa blýska
Hromy divo bijú 𝄇
𝄆 Zastavme ich, bratia
Veď sa ony stratia
Slováci ožijú 𝄇

II
𝄆 To Slovensko naše
Posiaľ tvrdo spalo 𝄇
𝄆 Ale blesky hromu
Vzbudzujú ho k tomu
Aby sa prebralo 𝄇

III
𝄆 Už Slovensko vstáva
Putá si strháva 𝄇
𝄆 Hej, rodina milá
Hodina odbila
Žije matka Sláva 𝄇

IV
𝄆 Ešte jedle rastú
Na krivánskej strane 𝄇
𝄆 Kto jak Slovák cíti
Nech sa šable chytí
A medzi nás stane 𝄇
 1
𝄆 [nat ta.trɔw sa ˈbliːs.ka]
[ˈɦrɔ.mi ˈɟi.ʋɔ ˈbi.juː] 𝄇
𝄆 [ˈza.staw.me ix ˈbra.cɪ̯ɐ]

[ˈsɫɔ.ʋaː.t͡si ˈɔ.ʐi.juː] 𝄇

2
𝄆 [tɔ ˈsɫɔ.ʋen.skɔ ˈna.ʂe]
[ˈpɔ.sɪɐʎ ˈtʋr̩.dɔ ˈspa.ɫɔ] 𝄇
𝄆 [ˈa.ɫe ˈbɫes.ki ˈɦrɔ.mu]

[ˈa.bi sa ˈpre.bra.ɫɔ] 𝄇

3
𝄆 [uʂ ˈsɫɔ.ʋen.skɔ ˈfstaː.ʋa]
[ˈpu.taː si ˈstr̩.ɦaː.ʋa] 𝄇
𝄆 [ɦej ˈrɔ.ɟi.na ˈmi.ɫaː]
[ˈɦɔ.ɟi.na ˈɔd.bi.ɫa]
[ˈʐi.je ˈmat.ka ˈsɫaː.ʋa] 𝄇

4
𝄆 [ˈeʂ.ce ˈjed.le ˈras.tuː]
[na ˈkri.ʋaːn.skej ˈstra.ne] 𝄇
𝄆 [ktɔ jak ˈsɫɔ.ʋaːk ˈt͡siː.ci]
[nex sa ˈʂab.ɫe ˈxi.ciː]
[a ˈme.d͡zi naːs ˈsta.ne] 𝄇
 I
𝄆 There is lightning over the Tatras
Thunders loudly sound
𝄆 Let us stop them, brothers
After all they will disappear
The Slovaks will revive 𝄇

II
𝄆 That Slovakia of ours
Had been sleeping by now
𝄆 But the thunder's lightnings
Are rousing the land
To wake it up 𝄇

III
𝄆 Slovakia is already rising
Tearing off Her shackles 𝄇
𝄆 Hey, dear family
The hour has struck
Mother Glory is alive 𝄇

IV
𝄆 Firs are still growing
On the slopes of Kriváň 𝄇
𝄆 Who feels to be a Slovak
May he take a sabre
And stand among us 𝄇
 I
𝄆 There is lightning over the Tatras
Thunder strikes wildly. 𝄇
𝄆 Let's stop them, brothers,
After all, they will be lost;
Slovaks will come to life. 𝄇

II
𝄆 That Slovakia is ours,
Post was fast asleep. 𝄇
𝄆 But thunderbolts
They encourage him to do so
To take over. 𝄇
 One of the trends shared by many Slovak Romantic poets was frequent versification that imitated the patterns of the local folk songs. The additional impetus for Janko Matúška to embrace the trend in Lightning over the Tatras was that he actually designed it to replace the lyrics of an existing folk song. Among the Romantic-folkloric features in the structure of Lightning over the Tatras are the equal number of syllables per verse, and the consistent a−b−b−a disyllabic rhyming of verses 2-5 in each stanza. Leaving the first verses unrhymed was Matúška's license (a single matching sound, blýska—bratia, did not qualify as a rhyme):
 Another traditional arrangement of Matúška's lines gives 4-verse stanzas rhymed a−b−b−a with the first verse made up of 12 syllables split by a mid-pause, and each of the remaining 3 verses made up of 6 syllables: