Keelak Stotram (कीलकस्तोत्रम् ), from the Durga Saptshati, with synchronized onscreen text.

LYRICS (English)
om namashchandikaayai
maarkandeya uvaacha |

om vishuddha gyaana dehaaya trivedee divya chakshushe |
shreyah praapti nimittaaya namaha somaartha dhaariNe || 1 ||

sarvameta dvijaaneeyaan mantraaNaamapi keelakam |
so api kshemamavaapnoti satatam jaapya tatparah || 2 ||

........ view complete lyrics on your Android device:
http://goo.gl/ylCNG2'>http://goo.gl/ylCNG2

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LYRICS (Sanskrit)

ॐ नमश्चण्डिकायै
मार्कण्डेय उवाच

ॐ विशुद्ध ज्ञानदेहाय त्रिवेदी दिव्यचक्षुषे ।
श्रेयः प्राप्ति निमित्ताय नमः सोमार्थ धारिणे ॥१॥

सर्वमेत द्विजानीयान्मन्त्राणामपि कीलकम् ।
सो‌ऽपि क्षेममवाप्नोति सततं जाप्य तत्परः ॥२॥

........ view complete lyrics on your Android device:
http://goo.gl/ylCNG2'>http://goo.gl/ylCNG2

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INFO:
Track: Keelak Stotra
Singer: Jitender Singh
Album: Durga Shakti

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DOWNLOAD links:
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India
► iTunes: http://goo.gl/0Z1rzc
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Rest of the world
► iTunes: http://goo.gl/ib7KYi
► Amazon: http://goo.gl/LjjNcQ
► Spotify: http://goo.gl/hZmSoV
► eMusic: http://goo.gl/uo2IZc

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IMPORTANT dates:
Vasant Navratri 2015: March 21 March 29
Maha Navratri 2015: October 13 October 23