Learn Hardcore Icelandic: Ég spila tónlist.

Icelandic doesn’t use a separate indefinite article like English a or an. Indefinite singular feminine nouns in the nominative (like tónlist) simply stand alone. If you wanted the music, you’d add a definite ending: tónlistin.

What case is tónlist in, and why doesn’t it change form?

Here tónlist is the direct object in the accusative case. Many feminine nouns (especially -ut ending compounds) have the same form in nominative and accusative singular. So tónlist remains unchanged whether it’s the subject or object.

How do you pronounce ég and the final g?

é is pronounced [jɛː], similar to English “yeh.”
The final g is a voiced velar fricative [ɣ], not a hard [g].
Altogether ég sounds roughly like [jɛːɣ].

Why is the verb spila right after ég? Doesn’t Icelandic have V2 word order?

Icelandic main clauses follow V2: the finite verb must be second. Here the subject ég occupies position one, so the verb spila comes second, and the object follows. If you front another element (like an adverb), spila still stays in second place:
“Í dag spila ég tónlist.” (Today play I music.)

Can I drop the subject ég and just say spila tónlist?

Yes, you can omit the pronoun because the verb form marks person and number. However, spila in present tense is identical for ég (I) and þeir/þær/þau (they), so dropping ég can be ambiguous.

Why isn’t there a preposition before tónlist, but I see ég spila á gítar for guitar?

When the object is abstract (music, sports, games), you use spila
- direct object with no preposition: spila tónlist, spila fótbolta.
When naming an instrument, you need á
- accusative: spila á gítar, spila á píanó.

How do I say “I am playing music” if I want the continuous/progressive sense?

Icelandic simple present often covers both English simple and progressive. If you specifically want “in the process of,” use the progressive construction:
“Ég er að spila tónlist.”

Can you show me the full present tense conjugation of spila?

Sure. Spila is a weak verb (-a class). Present indicative:
ég spila
þú spilar
hann/hún/það spilar
við spilum
þið spilið
þeir/sp ellas spila

Why is tónlist written as one word instead of tón list?

Icelandic loves compounds. Tónlist is formed from tón (tone) + list (art). Compounds are always written together in Icelandic.