Few years back, a student (talmida - תָלמִידַה) came to us in order to learn Hebrew, she didn't know how to build a sentence (mishpat - מִשְׁפָּט), how to correctly use verbs or tenses (she didn't even know there is a "gender" to objects in Hebrew), but her vocabulary was simply amazing, she knew so many words and could even pronounce them in a perfect manner.
Usually, even experienced students that know how to assemble simple sentences and conversations have a limited vocabulary compared to her, so how? How could she achieve such an impressive vocabulary without learning Hebrew???
Her answer was "Disney".
Confused, we asked her to elaborate, and she could sing every Disney song in perfect Hebrew, and knew what every word means, we studied this method with other students and the results were amazing.
King - melech' מֶלֶך
Lions - arayot אָרַיוֹת
The Lions King - melech' ha arayot מֶלֶך האָרַיוֹת
By practicing a song every week, students were able to learn relatively easily (kal - קָל) a lot of new words, and even remember their meaning for a long term!
Beauty (female) - yafa יָפַה
Beast - ch'aya חָיַה
The Beauty And The Beast - ha yafa ve ha ch'aya - היָפַה והחָיַה
So Be Prepared! We will make an Hebrew speaker out of you :)
Here is an awesome YouTube channel that you can start practicing with, the songs there even have transliteration + English translations on every sentence.
Tips - how to do it in the most effective way
You can hear as much songs as you like (because it's fun), but focus on 1 at a time.
After hearing the full song in Hebrew, hear it again, but stop at every sentence - and practice it's transliteration.
Grab a notebook.
Go over the sentence - see that you understand every word, write it down (Hebrew / transliteration / translation).
Try not to overdo it, three to four sentences a day is enough, as long as you remember the words you have learned.
Take your time, enjoy it, because above all it should be a fun experience :)
Good Luck!