on iTunes and/or last.fm

Solo only please

Mine:
1. Katy Perry
2. Kelly Clarkson
3. P!nk
4. Adele
5. Rihanna
6. Beyonce
7. Taylor Swift
8. Christina Aguilera
9. Ke$ha
10. Shakira

Legend X would be higher, but I've lost many plays

And Madonna is rising

1. Lady Gaga
2. Lana Del Rey
3. Katy Perry
4. Nicki Minaj
5. Rihanna
6. Beyonce
7. Miley Cyrus
8. Ke$ha
9. Lorde
10. Iggy Azalea

Since November 2013

1. Lana Del Rey
2. PJ Harvey
3. Björk
4. Madonna
5. Beyoncé
6. Fiona Apple
7. St. Vincent
8. Sky Ferreira
9. Lykke Li
10. Cat Power

Utada Hikaru 9303
Ayumi Hamasaki 8535
Ai Otsuka 5056
Mariah Carey 4013
Rihanna 3579
Baby K 3050
Britney Spears 2458
Loreena McKennitt 2419
Jordin Sparks 2322
Indila 1833

LastFM | Since May 2012

01. Mariah Carey
02. Adele
03. Ariana Grande
04. Katy Perry
05. Rihanna
06. Carrie Underwood
07. Shania Twain
08. Avril Lavigne
09. P!nk
10. Kelly Clarkson

01. Beyoncé (30,137p)
02. Taylor Swift (16,413p)
03. Katy Perry (9,267p)
04. Adele (5,409p)
05. Céline Dion (4,875p)
06. Rihanna (3,638p)
07. Lady Gaga (3,243p)
08. P!nk (2,746p)
09. Lana Del Rey (2,012p)
10. Shania Twain (1,331p)

In the last 30 days:

1. Shakira (878 Plays)
2. Marina and the diamonds (132 Plays)
3. Lana del Rey (108 Plays)
4. Gwen Stefani (75 Plays)
5. Adele (73 Plays)
6. Rihanna (34 Plays)
7. Charli xcx (31 Plays)
8. Nelly Furtado (26 Plays)
9. Christina Perri (20 Plays)
10. Celine Dion (19 Plays)

Apart from Shakira i dont listen to female artists that much tbh

1. Britney Spears
2. Beyoncé
3. Mariah Carey
4. Madonna
5. Lana Del Rey
6. Rihanna
7. Lady Gaga
8. Christina Aguilera
9. Taylor Swift
10. Ariana Grande

1-Britney
2-Rihanna
3-Beyoncé
4-Ariana Grande
5-Iggy Azalea
6-Katy Perry
7- Adele
8-Sia
9-Pink
10-Taylor Swift

1 Kat DeLuna
12.074
2 Lady Gaga
10.723
3 Rihanna
5.601
4 Björk
5.504
5 Jennifer Lopez
4.241
6 Britney Spears
4.065
7 Nicki Minaj
2.349
8 Beyoncé
2.132
9 Azealia Banks
1.860
10 Nelly Furtado
1.663

EDIT: Didn't see the 'solo only' part of the OP.

01. Marina & the Diamonds
02. Rihanna
03. Beyonce
04. Ellie Goulding
05. Lana Del Rey
06. Natalia Kills
07. Lorde
08. Nicki Minaj
09. Jhene Aiko
10. Katy B

Rihanna
Lady Gaga
Beyoncé
Katy Perry
Britney Spears
Lana Del Rey
Carly Rae Jepsen
Nicki Minaj
Ke$ha
Jennifer Lopez

1 - Aaliyah
2 - Rihanna
3 - Mariah Carey
4 - Beyonce
5 - JLO

Last 3 months:

1. Lana Del Rey
2. Mariah Carey
3. MO
4. FKA Twigs
5. Grace Potter & The Nocturnals
6. Grimes
7. Azealia Banks
8. Fiona Apple
9. Ellie Goulding
10. Florence and The Machine

Lana Del Rey
Ellie Goulding
Florence + The Machine
Mariah Carey
Lykke Li
Cat Power
Beyonce
Birdy
Katy Perry
Adele